More than 300 species of birds nest in by the river or use this corridor as they migrate between South, Central and North America. This includes the yellow-billed cuckoo (Coccyzus americanus). The area provides for more than 80 species of mammals, including jaguar (Panthera onca), coatimundi (Nasua narica), beaver (Castor canadensis frontador), 20 species of bats and several types of rodents. There are also over 65 species of reptiles and amphibians, among them Sonoran tiger salamander (Ambystoma mavortium stebbinsi) and western barking frog (Eleutherodactylus augusti). Some notable fish species native to the river are the endangered Gila chub (Gila intermedia), both the longfin and speckled dace, Sonora sucker and desert sucker, and the roundtail chub. The flora includes Fremont cottonwood (Populus fremontii), Goodding willow (Salix gooddingii), velvet mesquite trees, and the Huachuca water umbel (Lilaeopsis schaffneriana spp. recurva), Federally listed as endangered.