A lot of people at my age have leathery skin, but I don't.
Armadillos are small mammal with a thick leathery armour shell.
Leathery shells = Hard shells
No, they are usually hard-shelled. Snakes eggs are leathery.
Their eggs are leathery so they can get out of their shells easily
Having the texture or appearance of leather that's what leathery mean.
Fish have slimy, leathery skin. An example of a fish with slimy, leathery skin would be the a sea cucumber.
they have leathery eyelids to protect their eyes from the harsh sand storms.
Leathery fruit is often dry and very chewy, as if chewing leather.
celery
That is correct. The platypus's bill is not hard like the beak of a duck or any other bird. It is flexible, and made out of a leathery skin, so it feels soft and leathery to the touch.
The leathery shell of a reptile egg is to simply protect the eggs from any predators.
Platypus eggs are soft and leathery, rather than hard-shelled.