### animal | vertebrate | mammal:

Monotreme
* Most monotremes has-part glands.
* Most monotremes have features
  - hearts
  - pouches
  - possess mammary glands
* Some monotremes attain size.
* Some monotremes have bones
  - characteristics
  - nipples
  - scrota
  - teeth
  - lack teeth
  - possess several features
  - produce milk
  - share skeletal features
* also lack nipples for giving milk to there young.
* are a class of mammals
  - kind of rare mammals which lay eggs
  - special group of mammals which lay eggs
  - subclass of mammals
  - also different from other mammals because they lay eggs to reproduce
  - crepuscular animals only found in Australia and New Guinea
* are egg-laying mammals, so platypuses and echidnas lay eggs in order to reproduce
  - even more special, occurring only in Australia and Papua New Guinea
* are found only in Australia , Tasmania, and New Guinea
  - and on the island of New Guinea
  - highly specialized feeders and the adults have no teeth
  - long-lived mammals
* are mammals such as the duck-billed platypus that lay eggs
  - that are oviparous, or egg-laying
* are mammals that lay eggs, like a bird
  - quadrupeds
  - terrestrial organisms
* are the egg-laying mammals, and there are just three species
  - exceptions
* are the most primitive living mammal
  - type of living mammal
  - oldest living group of mammals in the world
* are the only living mammals where females lay eggs instead of giving live birth
  - mammals known that lay eggs
* are the only mammals that lay eggs , but they also feed their babies with milk
  - to lay eggs, but their overall pattern of reproduction is mammalian
* are unique among mammals as they lay eggs, rather than giving birth to live young
  - in that they lay eggs instead of giving birth to live young
  - types of mammals which lay eggs, rather than giving birth to live young
  - very highly modified for their particular ecological niches
* belong to the subclass Monotremata.
* consist of platypuses and echidnas.
* eat invertebrates, which they search for at night.
* have a low body temperature
  - single opening for their digestive and genital organs
  - unique chromosomal setup
  - eggs with a flexible, sticky, leatherlike shell
  - hair like other mammals, and the females produce milk
  - hair, and females produce milk in specialized glands
  - cell membranes
  - chests
  - cytoplasm
  - ears
  - nuclei
  - rib cages
  - vacuoles
* lack nipples so they have adapted
  - teeth as adults and have an unusual cranial shape
* live only in Australia and New Guinea.
* possess a few large chromosomes and several unpaired microchromosomes
* retain some of the primitive characteristics of mammalian ancestors, the therapsids.

### animal | vertebrate | mammal | monotreme:

Adult monotreme
* are toothless, but the young have incompletely formed vestigial teeth
* have no teeth.

Echidna
* eat ants and termites.
* lives everywhere except the tropical rainforest.

### animal | vertebrate | mammal | monotreme | echidna:

Beak echidna
* Most beak echidnas have brains
  - limbs
  - long tongues
  - short limbs
* curl into balls.
* develop pouches.
* eat ants
  - earthworms
* feed on ants
* have ability
  - impressive ability
* inhabit provinces.
* reach maturity
  - sexual maturity

Female echidna
* Most female echidnas develop pouches
  - have glands
* Some female echidnas possess pouches
  - reach ages
* dig burrows.
* incubate their eggs in pouches on their abdomens.

Female monotreme
* are like reptiles and birds, with a cloaca with one opening.
* have a with only one opening.
* secrete milk through pores on the surface of the abdomen.