Egg tooth
The eggtooth.
just a beak
their beak helps.the chicken eats the yolk then cracks at the shell and come out.
Uses the sharp part of it's beak to shell nuts, then just eats them normally
A beak is part of a bird.
The beak of the bivalve shell.
beak
umm... a mouth? a beak?
jellyfish
When the chick is big enough it starts to tap with its beak. There is a little hard point on the beak which eventually cracks open the shell. Out it comes!
"Aperture" means "opening".