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.
Birds, most reptiles and mammal like reptiles
Froggies :d
the animal inside will not hatch
The Robin is hatched from a baby blue egg.
An amphibian most likely.
the shell of an egg
This is an egg that can be in a shell and out of a shell.
the shell of an egg
is the shell of a hen egg as brittle as the shell of a duck or a goose egg
take a needle and get some of the blood of an adult animal and inject it into an egg of a different animal and see what happens (but for this you will need a really thin needle so it wont break the shell of the egg)
No. Poaching an egg is basically boiling an egg w/o its shell by carefully cracking the egg and tipping it into hot water.
egg shell
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.