Creatures of the BioShock series

BioShock has many animals seen in game, from angler fish to giant squids. These can be seen outside of Rapture roaming the ocean.

Giant Squid
These massive members of the squid family can be seen in BioShock and BioShock 2. In BioShock, one is seen when entering the city of Rapture via Bathysphere. It is seen swimming away either from the Bathy or the Whale later seen. Later in the game, one dead giant squid can be seen in a display case in Prometheus Point/Proving Grounds. In BioShock 2, it is first seen when first stepping into the ocean (seen after shark attacks anglerfish). Also a museum monument and posters in the Multiplayer map Point Prometheus talk about a Kraken(probably a Giant Squid).

Shark
Two types of Sharks can be seen around Rapture. A medium-sized shark that bears a resemblance to a Great White Shark, which is seen in the main menu and after Siren Alley is flooded. The other type is a massive unknown shark that has no dorsal fin, this type of shark is seen eating an angler fish at the beginning of the game.

Whale
An aquatic mammal found swimming around Rapture. Jack's eye is caught by the sight of a whale swimming by as he enters Rapture. A whale similar to this one can be seen in Episode One of Burial at Sea.

Turtle
Sea turtles can be seen around Rapture, most notably through the viewing windows in the elevators. Also inside the Proving Grounds a large skeleton of a sea turtle can be seen.

Angler Fish
These species of fish can be seen roaming the abyss around Rapture. One can be seen before being eaten by a shark in BioShock 2 when roaming outside of Rapture. Another one can be seen through a window in Burial at Sea. Also, in the multiplayer map Point Prometheus, a poster suggests extremely large angler fish roam outside of Rapture (it is unknown if this is real or an angler fish affected by ADAM).

Octopus
An Octopus can be seen in Burial at Sea, swimming outside.

Sea Horses
Large sea horses are seen on posters in the multiplayer map Point Prometheus.

Gulper Eel
A Type of eel normally found at the bottom of the ocean. Is see on a poster under the name of "Monster Eel"