Ambohitantely at the waterfall.
This large frog (5-6cm) was seen half submerged on rocks in the stream leading from the waterfall. Said to grow larger and to be edible, so perhaps M. grandidieri?
Under current (2011) taxonomy, this is closest to Mantidactylus grandidieri. But it is thought to belong to an as yet undescribed species referred to by Glaw & Vences (2007) as M. sp. aff. grandidieri 'North'.
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This enormous frog (the largest native frog I seen in Madagascar at least) was observed in a running stream at night in Park Mitsinjo. The guide told us it was a Mantidactylus but I was unable to find the species in the amphibian and reptile guide.
Mantidactylus grandidieri is a species of frog in the Mantellidae family. It is endemic to Madagascar. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, and heavily degraded former forest. It is threatened by habitat loss.