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because of its hard shell
Eggs have a shell on it to stop it breaking
because the shell acts as a barrier
ROFL can you imagine eggs without a shell? They have a shell so that the chicken doesn't fall out a go boom!
Yes. Bird eggs are similar in structure to reptile eggs with the main difference being that bird eggs have a hard shell while reptiles eggs have a softer, leathery shell.
eggs
The mother hen usually covers all her eggs to make sure that they are kept at the correct temperature for hatching and uses its beak to turn the egg over .
Reptile eggs have shell membranes.
Most likely there was a temperature or moisture problem. It is possible that the rooster has aged out and is "firing blanks" when he mates. You will need to "candle" the eggs to see if there is any growth going on inside the shell.
in a shell
Reptiles, such as turtles, snakes, and lizards, produce eggs with a leathery shell. The leathery shell is flexible and allows the eggs to absorb moisture and exchange gases with the environment. Unlike reptiles, birds and some other groups of vertebrates produce eggs with a hard, calcified shell.