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 for more than a few weeks. At the end of a month and a half a mouse is large enough and strong enough to have babies of its own.

But at two years of age a boy or girl could not live if its parents did not take care of it all the time. A lion, two years old, can roam for miles and miles through the forest, hunting its food. A baby, two years old, would be lost in five minutes if it toddled away from home.

Although children have done a great deal of growing by the time they are two years old they are then really only at the beginning of their growing. Each year they become a little bit bigger and heavier and taller and stronger.

While their bodies are growing their minds are growing too. They learn how to talk and how to think, how to use tools, how to read and how to write. It is a long, long time before they are grown up and can begin to have babies of their own.

They keep on growing and learning after the animals have stopped growing and learning, and they become wiser than any of the animals and can do many things that the animals cannot do. But babies and animals are born in the