The Appalachian mountain chorus frog (Pseudacris brachyphona), formerly known as just the mountain chorus frog, is a species of frog in the family Hylidae. The species is endemic to the United States. The natural habitats of P. brachyphona are temperate forests, rivers, intermittent rivers, swamps, freshwater marshes, intermittent freshwater marshes, freshwater springs, ponds, open excavations, and canals and ditches. It is threatened by habitat loss. Taxonomy The Collinses' mountain chorus frog (Pseudacris collinsorum), which ranges from southwestern North Carolina/southeastern Tennessee south to most of Alabama aside from the north and west to northeastern Mississippi, was formerly thought to represent a population of P. brachyphona, but was described as a distinct species in 2020. The description of this species led P. brachyphona to be renamed the Appalachian mountain chorus frog. Mountain chorus frogs are part of the family Hylidae, also known as the tree frogs. Tree frogs are one of the largest families in the order Salientia (also called Anura). Because they are so colorful and have many acrobatic talents, they have been called the "clowns and high-wire artists" of the amphibian world. The almost 500 species of tree frogs are found all over the world, from tropical regions to the Canadian woods, and Australia. They are found in places where toads are usually found. Physical characteristics The Appalachian mountain chorus frog is a small frog, but an intermediate size for the genus Pseudacris. It is colored different shades of grey or brown, including sorghum brown, deep brownish-drab, or mars brown. It is stocky in the body and broader in the head, which is very close to the structure and size of H. femoralis, the pine woods tree frog. The adult frog grows from in head and body length. The males are usually between 24 and 32 mm and the females between 27 and 34 mm. The Appalachian mountain chorus frog has a triangle between the eyes and a white line on the upper lip; the male has a dark throat. Geographic range and habitat The Appalachian mountain chorus frog can usually be found on the hillsides of southwestern Pennsylvania, western Maryland, southeastern Ohio, eastern Kentucky, West Virginia, eastern Tennessee, and northern Alabama north of the Tennessee River. They live on springy hillsides, grassy pools, and ditches, typically distant from water. The wooded hillsides where the frogs live are up to in elevation. Vocalization The Appalachian mountain chorus frog has a