With their claws.
for defending themselves from prey
yes tapirs teeth are sharp and they use them for defending themselves.
they use there claws to kill there prey or who ever threatens them
claws
A crab has pincers for defending itself and its like its hands for picking up things.
they support bymoving \
Crabs are not in the habit of attacking, but will defend themselves with a pair of slicing and crushing claws.
Hermit crabs pull themselves up into their hard shell. Other crabs must just get away as fast as they can.
People use crabs for various purposes. They are a popular seafood delicacy, often used in recipes for dishes like crab cakes, crab soups, and crab legs. Some people also keep pet crabs, such as hermit crabs, as pets or for educational purposes. Additionally, some crabs are used in medical research for studying various biological processes.
Crabs spawn roe (which female crabs carry on themselves for a couple of month). But technically roe also can be called "eggs" )
bird
A shark's brain helps them capture their prey. They also use it when they are defending themselves when in danger.