Sharks

Cartilaginous fish with elongated oval bodies, large fins (including their famous triangular dorsal fins, which can sometimes be seen above the surface), and skin covered in sharp denticles which both reduce drag and discourage parasites. Light, flexible skeletons and fatty livers give them close to neutral buoyancy without the need for swim bladders, although they sink slowly if they stop swimming.
Shark teeth are embedded in their gums rather than fixed to the jaw, so they are easily lost. Rows of replacement teeth lie behind the main ones, moving forward when needed.
Although often described as idiotic eating machines, many sharks have large brains and display complex behavior.
*Shark [-79]: Colorblindness [-10]; Discriminatory Smell [15]; Fish [-55]; High Pain Threshold [10]; Low Empathy [-20]; Passive Electroreception [11]; Peripheral Vision; Wild Animal [-30]