### animal | vertebrate | fish | shark:

Bull shark
* Most bull sharks eat fish.
* Most bull sharks feed on bony fish
  - grow to size
* Most bull sharks have eyes
  - snouts
  - prefer warm saltwaters
* Most bull sharks survive in fresh water
* Some bull sharks eat sharks.
* Some bull sharks prey on bottlenose dolphins
* are a 'requiem' species, reaching up to ten feet in length
  - common visitor to local beaches and can tolerate high levels of freshwater
  - able to regulate themselves to live in either fresh water or salt water
  - born alive in freshwater
  - categorized as viviparous as they give birth to live pups
  - fast swimmers
* are found along all of the continental coasts of subtropical and tropical oceans
  - in both freshwaters as well as in saltwater
  - large and stout, with females being larger than males
  - one of the three most dangerous species, beside the white shark and tiger shark
  - pale to dark gray above, fading to white on their underside
  - usually pale to dark grey above , and their undersides are white
  - very robust-bodied and have a blunt, rounded snout
  - viviparous , meaning that they give live birth
* can live in fresh water
  - store salt in their bodies
  - thrive in both saltwater and freshwater and can travel far up rivers
* have an unusual migratory pattern in comparison to other sharks
  - can detect electricity in animals
* live all across the world.
* prefer ocean saltwaters
  - shallow and warm ocean saltwater
* reach maturity depending on where they are.
* tend to occur in shallow coastal waters where visibility is often poor.
* travel far into freshwater rivers and lakes.
+ Bull shark, Behaviour, Reproduction
  * Bull sharks are viviparous, meaning that they give live birth. The gestation period is about one year, usually during the summer months but sometimes in early autumn as well. Bull sharks usually migrate to river mouths to mate and have their young. Coastal lagoons, river mouths, and estuaries with low salt contents are common nursery habitats
  - Description: Sharks
  * Bull sharks have a very sturdy body, and have a blunt, rounded snout, giving the Bull shark it's name. The first dorsal fin is large and widely triangular with a pointed tip. The second dorsal fin is noticeably smaller. The pectoral fins are also large, and have sharp tips. Bull sharks have quite small eyes as compared to other carcharhinid sharks, which might mean that vision is not a very important hunting tool for this species which is usually found in muddy waters. Bull sharks are usually pale to dark grey above, and their undersides are white. In young Bull sharks, the fins have black tips which turn to a dusky colour as they grow

Freshwater shark
* Most freshwater sharks inhabit shallow water.
* Some freshwater sharks have concentration.

Great hammerhead shark
* feed on fish.
* have heads
  - thick heads

Great white shark
* feed on animals
  - marine animals
* live in sea.

Ground shark
* are found in open oceans , seas , estuaries , and brackish waters.
* comprise some of the most familiar-looking sharks known to man.
* have a special membrane which protects their eyes when needed.
+ Carcharhiniformes: Sharks
  * Ground sharks have a special membrane which protects their eyes when needed. They have two dorsal fins, an anal fin, and five gill slits.