People want to know why things happen. It’s important to know the causes. For example, once you know that has made someone sick, you may be able to figure out how to make that person well.
As you read the next stories, trying to find the cause of what is happening.
Some baby birds have an egg tooth. The egg tooth is hard. It grows at the end of the bird’s beak. The bird has this tooth while it is in its shell. Soon after it gets out its shell, the egg tooth falls off.

Why do you think baby birds are fed by their mothers?