artificial heating unless household temperatures drop below . They need a large (at least ten-gallon) terrarium and do best with a substrate that will hold some humidity, such as commercial shredded bark or coconut husk bedding, or untreated topsoil on the floor of the terrarium. Tree frogs are arboreal, so the height of the tank is more important than the length. A variety of things for climbing, such as plants or branches, should be in the habitat. A shallow water dish should be included. Captive frogs should not be handled more than necessary; when necessary, clean gloves should be worn. As state symbols and bioindicators The American green tree frog became the state amphibian of Louisiana in 1997 and of Georgia in 2005. American green tree frogs can also be used as bioindicators for aquatic contamination. Synthetic compounds such as polychlorinated biphenyls are found in many pesticides and pollute the green tree frog’s aquatic habitats. Because the frog’s skin is thin and permeable, synthetic compounds absorb easily upon contact, making the species a viable variable to measure contamination. References External links . Database entry includes a range map and brief justification of why this species is of least concern. Betten, Jane. "Hyla cinerea (green treefrog)." Animal Diversity Web, University of Michigan "Green Treefrog, Hyla cinerea." Northern Prairie Wildlife Research Center, U.S. Department of the Interior USGS page Images of development from egg to adult frog The Green Tree Frog: How a Bill Becomes a Law PBS Learning Media Dryophytes Frog, American Green Tree Frog, American Green Tree Articles containing video clips Amphibians described in 1799 Symbols of Louisiana Symbols of Georgia (U.S. state)