Eggshells can vary in color from white to brown, and they can also have different textures. Some eggshells are smooth, while others are bumpy or even spiky. The color and texture of an eggshell is determined by the species of bird that laid it.
Eggshells are also an important source of calcium for birds. When a bird hatches out of its egg, it absorbs the calcium from the eggshell to help build its own bones and feathers.
Here are some additional facts about animal eggshells:
* The eggshell is made up of three layers: the outer layer, the middle layer, and the inner layer.
* The outer layer of the eggshell is made up of a protein called keratin, which is the same protein that makes up human hair and nails.
* The middle layer of the eggshell is made up of calcium carbonate.
* The inner layer of the eggshell is made up of a protein called collagen, which is the same protein that makes up human skin and bones.
* The eggshell is porous, which means that it allows air and moisture to pass through.
* The eggshell helps to regulate the temperature of the egg.
* The eggshell helps to protect the egg from predators.
* The eggshell is an important source of calcium for birds.