### animal | vertebrate | fish | shark:

Nurse shark
* Most nurse sharks have fins.
* are brownish in color
  - night hunters
* are nocturnal , and are very sluggish and are harmless unless bothered
  - hunters and rest during the day
  - nocturnal, bottom dwelling, inshore sharks found in lagoons and outer reefs
  - very active during the night
* do well in captivity.
* eat bottom-dwelling fish, crabs, lobsters, and shrimp.
* feed mostly on bottom invertebrates, including lobsters and sea urchins.
* feed on crustaceans , mollusks , sea snakes , fish , coral , and tunicates
  - small animals living on the bottom
* have dorsal fins
  - the simplest type of tooth arrangement found in sharks
* rely primarily on smell to locate prey.
* spend most of their time at the bottom of shallow water.
* swim effortlessly looking for small bottom-dwelling invertebrates.
* use thick lips to suck food from rocky crevices.
* vary in color from tawny to dark brown.
+ Nurse shark, Behaviour
  * Nurse sharks are very active during the night. In addition to swimming near the bottom, the Nurse shark can move around on the sea floor, using its flexible, muscular pectoral fins as limbs
  - Description: Sharks
  * Nurse sharks have the simplest type of tooth arrangement found in sharks. This means that there is no overlapping between the teeth, and that forward movements of teeth leading to shedding does not depend on other teeth. With sharks that have many overlapping teeth, the replacement of teeth cannot take place until the outer blocking teeth are lost. Young Nurse sharks can replace their teeth quicker than adults. Also, teeth replacing occurs faster in summer, when water temperatures are higher. Once the Nurse sharks reach maturity, their growth rates usually become much lower

Oviparous shark
* include horn sharks
  - zebra sharks
* lay egg cases.

Prickly shark
* appear to be extremely sluggish.
* are rare deep water sharks that are found in the Monterey Bay.

Sand tiger
* are the only shark known to come to the surface and gulp air.
* have a unique variation of ovoviviparity called intrauterine cannibalism.

### animal | vertebrate | fish | shark:

Specie of sharks
* Many species of sharks are endangered due to illegal killing
  - similar, and often are hard to tell apart
* Most species of sharks are found in the oceans
  - have a rounded body, shaped somewhat like a torpedo
  - reside in saltwater which means they are found in the oceans
* Some species of sharks give live birth to their young.
* Some species of sharks have barbells, otherwise known as whiskers, near their nostrils
  - protective coverings for their eyes
  - lay eggs with the developing embryo covered by a tough, protective case
  - live in coastal waters, but others dwell far out at sea

Spinner shark
* Most spinner sharks feed on fish.
* are large and slender and have a pointed snout
  - viviparous and have a yolk sac placenta
* have a wide range and make seasonal migrations
  - no interdorsal ridge
* live at the surface and in shallows, and they migrate along the coasts.

### animal | vertebrate | fish | shark:

Thresher shark
* All thresher sharks have tail fins nearly as long as the rest of the body.
* are active, strong swimmers that are favorites among sport fishermen
  - long-tailed subtropical fish that swim along the surface
  - most plentiful off the California coast during the summer
  - ovoviviparous marine animals
  - very active fighters when hooked
* feed chiefly on small schooling fish such as herring, mackerel and menhaden
  - upon small fish such as anchovies, mackerel, and squid
* live in warm seas around the world.
* use their long tails to stun shoaling fishes.