'Sharks have no swim bladder so this oil-filled organ helps keep them from sinking'
Liver
SHARK!: Sharks have no swim bladder so this oil-filled organ helps keep them from sinking
Sharks have no swim bladder so this oil-filled organ helps keep them from sinking
Sharks have no swim bladder so this oil-filled organ helps keep them from sinking
SHARK!
Liver
SHARK!