Abstract
A group of related species of Rana living along streams in Bornean rain forest do not have male advertisement calls. They are also unusual among frogs in that males are larger than females and have disproportionately large heads and enlarged odontoid processes at the tips of the dentaries. At least one of these species, R. blythi, oviposits in nests. We compare the breeding behavior and ecology of the voiceless R. blythi to a syntopic, voiced congener, R. signata. Males of R. signata, like those of many calling frogs, form choruses around stream breeding sites, and attract females to those sites
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