### animal:

Male
* All males are at risk of testicular cancer, regardless of age
  - capable of multiple orgasms
* Every male is born with a covering over the sensitive end of the penis.
* Many males also go through courting rituals to attract females
  - use artificial lubricants to facilitate masturbation
  - are uncomfortable with narrow gender roles and their peer's abusive behavior
  - die annually from injuries incurred while fighting during breeding seasons
  - live solitary lives or enter a group when mature
* More males use drugs than females, but the gap between the two has become smaller.
* Most males die early in the spring after being driven from the nests
  - get erections
* Most males have an XY chromosome structure
  - erections periodically throughout the night
  - molt during the summer and fall months, but the time can vary greatly by year and area
  - provide parental care because they are simultaneously holding a territory
  - reach sexually maturity by the time they are three or four
* Some males also use silk to tie up the females as part of a courtship ritual
  - are able to orgasm with prostate stimulation alone
  - become solitary after they have reached adulthood
  - can be aggressive with other male dogs in the household
  - engage despotic sexuality
* Some males mate with any female they encounter
  - more than one female in a breeding season
  - never mature sexually, even though they develop mature plumage
* also adjust their ejaculates in response to sperm competition in terms of quality
  - compete rather intensely, however, especially in developed social hierarchies
  - contain an aedeagus , a sperm-transferring organ
* also have estrogen, naturally, just as females produce testosterone
  - same-sex relations, typically with multiple partners of the same age
  - scent glands on their chests, just above the collarbone and close to the armpit
  - use body movements to communicate interest to potential mates
* appear to mark with urine, and both males and females mark by rubbing their necks on trees
  - mate once and die, while females have been shown to mate more than once
* are able to ejaculate the semen, which contains the sperm
  - roar when they are about one year old, and females can roar a few months later
  - aggressive when it comes to protecting their territory and vying for females
  - almost always the perpetrators of sexual abuse in the United States
  - also creatures with only one X-chromosome
* are at higher risk for developing high blood pressure at an earlier age than females
  - least four times more likely to die from suicide than females
  - dominant over females, and young animals tend to be dominant over older animals
  - far more likely to engage in physical aggression than females
  - four times more likely to commit suicide than females
  - genders
  - highly competitive over females and large bears often drive smaller ones away
  - known to mate often, but it is possible some go through life without mating at all
  - less prone to cancer, but neutering helps with litter training, aggression, and stress
  - more likely to die from cancer than females
* are more likely to have coronary heart disease than females, whether younger or older
  - heart disease than women, whether younger or older
  - murder women than to murder other men
  - never carriers but express the one allele on the X chromosome
  - people
  - prone to the disease at a much earlier age than women
  - protective of their offspring, keeping a watch for other males and predators
  - responsible for most bites, and probably all deaths, in humans
* are the dominant sex in chimpanzees, whereas bonobo females have no truck with male machismo
  - only butterfly to have a frenulum
  - thought to be dominant over females because they are larger in mass and length
* begin having erections in the womb, during the fetal stage.
* can accelerate puberty in prepubescent females.
* can also get breast cancer
  - use particular behaviours or structures to manipulate how females use sperm
  - be proportionately larger than females, and have male characteristics such as jowls
* can be very competitive when it comes to getting the attention of females
  - dangerous if wounded or hunted and have been known to kill humans and leopard
  - victims of rape
  - easily father kittens from as young as five months, to over ten years
  - get seriously injured and carry scars for the rest of their lives
  - have erections while still in the uterus, and some boys are born with an erection
  - live in cages with one square foot of floor space all their lives
  - protect their testicles by wearing athletic cups during sports
  - reproduce each year, and females reproduce on average only once every four years
* carry a higher percentage of water than females, because male bodies have more muscle
  - than females, because males bodies are more muscle
* compete for the attention of females by displaying physical characteristics or behaviors.
* contain an x chromosome and a y chromosome, whereas women contain two x chromosomes.
* describe their phones as status symbols and symbols of belonging.
* develop blindness at an early age
  - their own distinct brain circuitry only after being bathed with testosterone
* exist merely so that females can reproduce themselves.
* experience testicular shrinkage, breast development, and decreased sperm count.
* fight for access to mates, both through scent marking and actual physical contact
  - females and dominance is usually due to size, fighting ability, and temperament
* first spin a small 'sperm web', in which they put a small amount of semen on.
* form a distinct social hierarchy with high levels of both competition and association.
* generally have a two-pronged penis, which corresponds to the females' two vaginae
  - live longer than female bats
* get esophageal cancers more frequently than females.
* give off sperm cells and females give off egg cells.
* grow faster because much of a female's energy goes into egg production.
* have a dominance hierarchy based on size
  - which is maintained by aggression
* have a higher mortality rate than females at all ages
  - muscle content in their body weight
  - large penis, large testicles, and ejaculate lots of sperm
  - linear dominance hierarchy based on age and size
  - penis like organ called a phallodeum which is the extruding part of the cloaca
  - penis, scrotum, and testicles
  - consistently higher mortality rates at all ages compared with females
  - enlargement of the testes and penis, and facial and other body hair begins to grow
  - higher mortality from all leading causes of death
  - larger home ranges than females, and they travel greater distances on a daily basis
  - manes and all lions have a tuft of fur at the end of their tail
  - many more traits that function only in courtship or male-male competition
  - more testosterone in their circulation than females and men are more aggressive
  - no reproductive organ, so reproduction occurs by the pair rubbing their cloacas together
  - only one X chromosome which is inherited from the mother at conception
  - red-green defects if they inherit a defective gene from their mother
  - the highest rates of suicide, with suicide being the top cause of death in young men
* have two copulatory organs called hemipenes, one on each side of the base of the tail
  - reproductive organs called hemipenes
* inherit their X chromosome from their mothers.
* is an animal
* lose body weight over the course of the breeding season as they defend their harems.
* mature sexually as soon as two years of age.
* never leave the water once they enter it, unlike females, which nest on land.
* normally disperse once they grow large enough to compete with dominant males
  - have lower voices than females because males usually have longer vocal cord
* often can increase their reproductive success by extra-pair copulations
  - defend their homes and compete over females by kicking, clawing, and chasing each other
  - have to fight with each other in order to earn the right to mate with a given female
  - kill the babies of rivals to increase the availability of females to mate again
* only have one X chromosome and hence have only one allele for each X-linked gene
  - chromosome, which they inherit from their mother
* organize their relationships along a dominance hierarchy.
* possess only one copy of the X chromosome, which is inherited from their mother
  - seminal vesicles, and large paraxial organs produce the spermatophore
* primarily use their canines to fight others, but antlers can also be used.
* produce sperm cells, and females produce egg cells.
* reach sexual maturity at the age of one year.
* receive their X chromosome only from their mothers.
* require more iron because the buildup of muscle mass is accompanied by greater blood volume.
* see the world as a hierarchy of power.
* serve only one function, to fertilize the queen during swarming.
* sometimes care for orphaned siblings, even if the care-giving male is fully mature.
* turn images into action, and women turn their fantasies into motives for love.
* typically live for ten years in the wild, and females for up to seventeen years.
* use body movements to visually communicate the boundaries of their territory to other fish
  - deadly weapons for sport, for war, for personal gain far more frequently than do females
  - their organ to rub females and improve their sperm's chance of success
* usually extend their territories in order to attract as much females as they can
  - reach sexual maturity at a younger age and a smaller size than females
* vary more in their reproductive success than females.
+ American Robin, Subspecies: Thrushes
  * It is the about the same size as or a little larger than main subspecies. It is lighter and is much more of a brownish-gray color. It has very little white on the tip of the outer tail feathers. Some 'T. m. propinquus' birds do not have any orange-red on the breast. This is probably more common in females. Males are usually darker. They may show light or whitish sides to the head.
+ Ant, Development and reproduction, Mating, The nuptial flight:
  * Most ants produce a new generation each year. During the species specific breeding period, new reproductives, winged males and females leave the colony in what is called a 'nuptial flight'. Typically, the males take flight before the females. Males then use visual cues to find a common mating ground, for example, a landmark such as a pine tree to which other males in the area converge. Males secrete a mating pheromone that females follow. Females of some species mate with just one male, but in some others they may mate with anywhere from one to ten or more different males. Mated females then seek a suitable place to begin a colony. There, they break off their wings and begin to lay and care for eggs. The females store the sperm they obtain during their nuptial flight to selectively fertilise future eggs.
+ Arctic, Animal life
  * They are excellent swimmers, and the coldest water does not bother them. They just jump into any leads that open in the pack ice and swim across. They are quiet enough to sneak up on a sleeping seal and strong enough to kill it with one blow. They have a very strong sense of smell, which they use to find prey out on the ice. Polar bears live most of their lives out on the pack ice. Males go to the land only when the ice is gone. The females, however, will dig themselves into a den of snow on land for the winter. There, the mother bears have their cubs, usually twins. Bears usually eat fish, birds' eggs, seaweed, and dead whales, but they would rather have a meal of seal or walrus. The Arctic fox will often trail the bears onto the ice to eat their leftover food. The fox also eats rabbits, lemmings, and voles.
+ Barbary lion, Looks and behavior: Panthera :: Mammals of Africa
  * The Barbary lion is the biggest and heaviest kind of lion. Males weigh about , and females weigh about. Male lions were about  long and females were about  long. Some scientists think that these sizes and weights are too large. These scientists think that the Barbary lion is probably the size of the lions found in East Africa.
+ Bearded seal, Reproduction and Lifecycle: Pinnipeds :: Mammals of Great Britain
  * Just before the pups are weaned, a new mating cycle takes place. Females ovulate at the end of their lactation period, but stay close to their pups, ready to defend them if necessary. This sound may attract females, or may be used by the males to say what territory is theirs or their readiness for breeding. Males live in the same areas from one year to the next.
+ Betta splendens, Appearance: Perciformes
  * Males have a tendency to have longer caudual fins. They come in many colors.
+ Bullfrog, Adults: Frogs :: Symbols of Oklahoma
  * Bullfrogs are either brown or green. They also have darker spots on their back. Bullfrogs have webbed feet for swimming. They can leap up to. Male bullfrogs can be heard roaring when mating with a female. Males also have bigger tympanic membranes which cover their ears. Bullfrogs have brown or gold eyes. They also have broad flat heads and bodies. The mouth of a bullfrog are small and have tiny teeth inside.
+ Caenorhabditis elegans: Nematodes :: Model organisms
  * A hermaphrodite makes sperms when its in a larval stage and makes ova in an adult stage. A male can only make sperm. Males are a little smaller than hermaphrodites.
+ Delphinus, Description: Cetaceans
  * Males are longer and heavier than females. They are dark grey on the back, the belly is white, and the sides are light grey, gold, or yellow in color.
+ Four-horned Antelope, Appearance: Bovines
  * Four-horned antelopes are about 0.60 meters high, and they weigh about 20 kilograms. They have a light yellowish-brown fur with a white underside. They have a black stripe down their forelegs. Males have four horns. The back horns are about 10 centimeters long, and the front horns are up to 4 centimeters long.
+ Giant panda, Appearance: Ursidaes
  * Giant pandas are about the size of an American black bear. They are about  tall at the shoulder when they are standing on all four legs. They are about  long. Males weigh up to  in the wild. Females usually weigh less than.
+ Giraffe, More Facts: Even-toed ungulates
  * Giraffes are the tallest animals on Earth. They have long legs and long necks. There are 7 bones in their necks, the same as ours, but much bigger. Males can grow to nearly five and a half metres tall, and females to nearly five metres tall.
+ Hominidae
  * Males are larger than females. Hominids are primates with no tails, robust bodies and well-developed forearms. All digits have flattened nails.
+ Humpback whale, Whale song
  * The male whale is known to sing for up to 22 hours at a time. Because whales do not have vocal chords, they make songs by forcing air through their nasal passages. Every male has a different song. We don't yet know why they sing, it might be to call a female or scare away other males. The songs are made up of a pattern of low notes repeated over a period of hours or days. The whales slowly change their songs over a period of years.
+ Jackson's Chameleon, Characteristics, Males: Chameleons
  * Males are easily recognized, they have two horns above their eyes and one horn on their nose. If males are kept together in a cage, they get stressed, and eventually die. But they have been know to live together, it all depends on the chams themselves.
+ Lemur, Feeding Habits and Life
  * Lemurs mostly eat fruit, leaves, and other plant parts. They live in family groups of 5 to 42 members which is called a troop. Females are dominant and remain in the same troop for life. Males move between troops. The female's gestation period lasts four to five months, and they usually have between one and two babies. Lemur mothers nurse their babies until they are about four months old. Then they begin to feed the babies solid food such as fruit. Lemurs spend most of their time in the trees. Some are fantastic leapers, flinging themselves from tree to tree.
+ Line of succession to the British throne: British monarchy
  * The succession is decided firstly by gender and then by age. Males come before females, and older children come before younger children. When someone who is in line to the throne has a child, that child comes after them and their other children, but before anyone else in the line of succession.
+ Lyrebird, Mating system, Breeding: Passeri :: Birds of Australia
  * The breeding cycle of the lyrebirds is long, and lyrebirds are long-lived birds. They can live up to thirty years. They also start breeding later in life than other passerine birds. Female Superb Lyrebirds start breeding at the age of five or six, and males at the age of six to eight. Males defend territories from other males. Tthese territories may contain the breeding places of up to eight females. In a male's territory, he makes or uses display platforms.
+ Mandrill
  * The skin colours brighten as the animal gets more excited. Males live mostly on the forest floor, while females and young climb up into trees and bushes.
+ Markhor: Caprids :: National symbols of Pakistan :: Mammals of Pakistan :: Plants and animals of Kashmir
  * Markhor are 65 to 115 centimetres tall at the shoulder. They usually weigh from 40 to 110 kilograms. Females are a tan colour with a white underbelly and a pattern of black and white on the legs. Males are a lighter tan colour with the same white underbelly and pattern on the legs. Males also have a black face and lots of long white fur on their neck and chest which can grow down to their knees.
  * Markhor often stand on their back legs to reach the top leaves of trees. Males usually live alone.
+ Meerkat, How meerkats act: Feliformia
  * Despite the family bond of meerkats, sometimes a female might kill another female's pups. The leader might also kick out some females from the group. Males sometimes leave the group for a short time to look for females in other groups to mate with.
+ Minke whale, Description: Baleen whales
  * The minke whales are the second smallest baleen whale. Only the pygmy right whale is smaller. Males measure an average of  and females  in length. They become adults after 6 to 8 years.
+ Octopus, Reproduction and death: Cephalopods
  * When octopods reproduce, males use a specialized arm to put packets of sperm into the female's mantle cavity. Males die within a few months of mating. In some species, the female octopus can keep the sperm alive inside her for weeks until her eggs are mature.
+ Old World monkey: Monkeys
  * Males leave the group on reaching adolescence, and find a new troop to join. In many species, only a single adult male lives with each group, driving off all rivals, but others are more tolerant, establishing relationships between dominant and subordinate males. Group sizes are highly variable, even within species, depending on the availability of food and other resources.
+ Parides alopius, Description
  * The upper side of the wings is black. The first row is white. The second row is pink. Males have fewer white spots than females. The underside of the wings is similar to the upper side. The row of pink spots on the underside are more noticeable than the pink spots on the upper side.
+ Parthenogenesis: Methods of reproduction :: Insects
  * These female aphids may or may not have wings. Males only appear in any number at the close of the season. Females then give birth sexually during autumn, laying eggs. Therefore aphids are said to undergo cyclical parthenogenesis.
+ Phengodidae: Beetles
  * They feed on millipedes and other animals they find in the soil and litter. Males are winged. They are attracted to lights at night. They are probably short-lived and do not feed at all. In some species, adult males can also produce light. Females have organs that produce a green or yellow light on their trunks.
+ Prostate: Anatomy of the male reproductive system :: Glands
  * The prostate is often referred to as the male g-spot, which is a spot inside the female vagina that causes intense pleasure when it is stimulated. The prostate can be massaged by using a finger or during anal sex. Some males are able to orgasm with prostate stimulation alone.
+ Red Kangaroo, Description: Macropods :: Marsupials of Australia
  * Males grow up to  tall and weigh up to. Females are   tall and weigh up to. The tails is about  long. There are often reports of larger Red Kangaroos, with some males reaching about  tall
  - billed Quelea: Passeriformes
  * Nests are built by the males and take about seven days to complete. Males defend the nest while building it and become very angry when something gets too close. After it is complete, females lay 3 to 7 eggs. Eggs hatch in about two weeks. Males continue to defend the nest after the eggs hatch
+ Stoat: Mustelids
  * Males are bigger than females. Stoats are also called ermines. They can grow to be as long as 30 centimeters. They eat other small animals and bird eggs, and can kill animals bigger than themselves. They can also store food for later. They kill by biting the neck of their prey at the place where the skull attaches to the rest of the body, cutting the brain stem.
+ Texas coral snake, Description: Elapidae
  * The Texas coral snake has a pattern of black,yellow, and red stripes on its skin. Males are smaller than females. They have smooth scales, a round head, and eyes with round pupils.
+ Tiger Salamander, Description
  * Tiger salamanders almost always stay on land as adults, and usually only return to the water to lay eggs. But also they live in both land and water. They also like to swim, even if they are on land. They also are good swimmers. Like all ambystomatids, they are extremely loyal to their birthplace, and will travel long distances to go back. Males bump a female to initiate mating, and then deposit a spermatophore on the lake bottom. The female picks up the packet and deposits the now-fertilized eggs on vegetation. Large-scale captive breeding of Tiger salamanders has not been accomplished, for unknown reasons.
+ Urial: Mammals of Asia :: Bovids
  * It has reddish-brown long fur that fades during winter. Males have a black ruff stretching from the neck to the chest and large horns. It is found in western central Asia. The two groups have often been considered separate species. Mammal Species of the World. A Taxonomic and Geographic Reference'. Johns Hopkins University Press, Baltimore.
+ Western diamondback rattlesnake, Description: Vipers
  * Males are much larger than females, but they become larger when they mature. It is then covered with dark gray-brown blotches and white stripes.
+ White-headed capuchin, Behavior, Social structure: Monkeys :: Mammals of America
  * Female capuchins have linear dominance hierarchies. Males are typically dominant to females. The alpha male is always easy to discern, but there are sometimes ambiguous rankings among subordinate males. Males cooperate in coalitions against potential predators, and also in defense of the group against other males. Male emigration to a new troop typically occurs about every 4 years, so most males are in constant danger of having to defend themselves against other groups of males.