Gray Tree Frog

The two species, H. versicolor & H. chrysoscelis, are virtually indistinguishable, the only readily noticeable difference is their calls - H. chrysoscelis has a shorter, faster call. Also referred to as the North American Tree Frog, Gray tree frogs change color slowly and may be found in gray, green, olive, or many hues of these colors depending on temperature and the substrate they are sitting on. They feed on small insects and spiders. Gray tree frogs hibernate on land. They produce glycerol, an antifreeze used by some insects to protect cells during the freezing process and can survive temperatures as low as 21 F (-6 C) for several days.