Goodbye winter! Today marks the spring or vernal equinox, the official beginning of springtime in the Northern Hemisphere. Starting today, regions north of the equator will have longer days than nights.

In some parts of the world, the arrival of spring is announced by the guttural chorus of tree frogs. They tend to be small and slender since their weight has to be supported by branches and twigs in their habitats. They can be recognized by the sticky discs on the tips of their fingers and toes, which help them cling to surfaces. The American green tree frog is the official state amphibian of both Louisiana and Georgia.