Distribution and Habitat
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This species occurs in southeastern Brazil, in the states of Rio de Janeiro, São Paulo, and Paraná. It is found in both primary and secondary forest, along forest streams and rivers, on steep hillsides up to 1,200 m above sea level (IUCN 2006).
Haddad, C. F. B., and Giaretta, A. A. (1999). ''Visual and acoustic communication in the Brazilian torrent frog, Hylodes asper (Anura: Leptodactylidae).'' Herpetologica, 55, 324-333.
Life History, Abundance, Activity, and Special Behaviors
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Hylodes asper lives along forest streams and rivers. For territorial displays in this high-noise environment, the frog uses a kind of semaphoring (slowly raising and waving a rear leg, one at a time), in addition to calling. This behavior is known as foot-flagging, since the slow waving of the frog's large rear foot resembles a flag waving.
