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Falling Leaves
Autumn, or fall, is the season between summer and winter. The days become shorter, and the air gets cooler. Trees sense these changes, so they start preparing for colder weather.
Trees that have leaves block water and food from coming through the branches to the leaves. When this happens, the leaves die. They fall off the tree or the wind blows them away. This is why autumn is usually called fall in America. As the leaves start to die, they appear to change from green to red, yellow, orange, or brown.
Actually, the leaves are really these colors all year long. They look green because of a chemical called chlorophyll. Chlorophyll works with the sun to help the trees make food. In autumn, when there is less sun, the tree cannot make chlorophyll, so the green color fades. This reveals other colors, like red and yellow, that were always in the leaves.
Like trees, animals also sense changes in the cooler autumn climate. Animals that hibernate eat a lot during autumn. They gain weight to store energy in the form of fat. They use this energy to survive the winter while hibernating. Many birds survive the cold in a different way: they leave. Each year, many birds migrate south to warmer climates during autumn. They migrate north again in the spring. Not a bad idea if you ask me! After all, who would refuse a mid-winter trip to sunny Thailand?
