No, they are usually hard-shelled. Snakes eggs are leathery.
Monotremes are egg-laying mammals, and their eggs are not hard-shelled, but leathery. The monotremes include the platypus and echidna.Reptiles also lay rubbery/leathery eggs.
The leathery shell of a reptile egg is to simply protect the eggs from any predators.
A leathery shell is a shell that is flexible rather than solid like the shell of a bird egg. A snake's egg has a shell that is flexible, as does a turtle's egg.
The egg of a platypus is leathery. It is not hard-shelled like a bird's egg.
Birds lay normal, hard-shelled eggs while reptiles usually lay eggs with a leathery shell that is flexible.
The birds skin is a leathery material but when wet starts to feel greasy.
They are called amniotic eggs.
amnionic eggs
The eggs laid by monotremes (egg-laying mammals) are still called eggs. They are soft-shelled and leathery, rather than hard-shelled like birds' eggs.
They usually have a leathery texture, and are, generally, distinctly elongated, although some can be fairly spherical.
A leathery shell is a protective covering made of tough and flexible material, resembling leather. It is found on certain types of fruits, seeds, and animals such as turtles and tortoises. This type of shell provides protection and support to the organism.
A reptile egg is much much much softer than birds egg.