Do all birds come from eggs?

Yes, all birds come from eggs. In fact, one of the defining characteristics of birds is that they are oviparous, which means that they lay eggs. Birds are the only group of animals that are entirely oviparous.

The eggs of birds vary greatly in size, shape, and color, depending on the species of bird. Some bird eggs are as small as a pea, while others are as large as a grapefruit. Some bird eggs are round, while others are oval or even triangular. And some bird eggs are white, while others are brightly colored.

Despite their differences, all bird eggs have the same basic structure. The outermost layer of the egg is called the shell. The shell is made of calcium carbonate, which is the same mineral that makes up seashells. The next layer of the egg is called the albumen, or white. The albumen is made up of protein and water. The innermost layer of the egg is called the yolk. The yolk is made up of fat and protein.

When a bird lays an egg, it is usually covered in a protective coating called the bloom. The bloom helps to prevent the egg from drying out and also protects it from bacteria. The egg will hatch after a period of time, depending on the species of bird. When the egg hatches, the baby bird will emerge. The baby bird will then grow and develop until it is old enough to fly and care for itself.