Page 177 - (DK) Super Shark Encyclopedia: And Other Creatures of the Deep

SAFETY FIRST

Many sharks rely on vision for hunting,
so they need to protect their eyes when
attacking prey—even a little fish can inflict
a painful slap. At the moment this tiger shark
attacks, it automatically blinks a protective
membrane over its eyes to prevent the
flailing prey from causing damage. Many
other species of sharks lack this membrane.
Instead, they roll their eyes backward in their
sockets when they lunge for their prey.