It is these changes as much as the weather itself that make the seasons distinctive. In Spring, plants start growing, producing shoots and leaves. Frogs start laying their spawn, birds build nests and lay their eggs.
Insects emerge from hibernation or hatch from over-wintering eggs.
In Summer, plants are in full growth. Many will flower in summer. Animals are fully active and their young are feeding and growing. In Autumn, nature is preparing for winter. Trees are storing their waste products in leaves which they will then shed.