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Houston toad
The Houston toad (''Bufo houstonensis'') is an endangered species of amphibian that is endemic to Texas in the United States. This toad was discovered in the late 1940s and named in 1953. Official estimates are that just 3,000 – 4,000 adult Houston toads are left in the world.
==Characteristics==
The male Houston toad grows to 2–3.5 inches when mature with the female being larger and bulkier. Although generally brown and speckled, their color can range from black to purplish gray, sometimes with green patches. The toads typically live 2–3 years and create burrows for protection from the cold in the winter and the hot, dry conditions of the summer. They are nocturnal and feed on insects and small invertebrates.
During February and March, the male emits a high clear trill by distending a vocal sac on its throat, in hopes of attracting a mate. A female will choose a male based on certain characteristics of his call. Small isolated pools and ponds are the toad's main breeding ground. A female toad will lay several thousand eggs in long single-egg strands that are fertilized externally by the male as they are laid. The eggs hatch within seven days and tadpoles take between 15–100 days to turn into little toads. The toadlets then leave the breeding pond and begin to forage for prey such as ants, beetles and moths.
They move by making short hops. Since they cannot usually outrun their predators such as snakes, turtles, large birds, raccoons, and other frogs, the toads have developed coloration and rough skin to camouflage themselves. Also, their skin secretes chemicals that are distasteful, and sometimes poisonous, to predators. In addition to protecting the Houston toad from being eaten, some of these chemicals have proven useful medicines to treat heart and nervous disorders in humans.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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