Leptomantis angulirostris

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Leptomantis angulirostris, the masked tree frog, is a small frog in the Rhacophoridae family. It is listed as Near Threatened by IUCN. It lives in Indonesia and Malaysian Borneo, mainly in primary rainforests along rocky streams above about 1,000 meters, including the Crocker Range and Mt. Kinabalu National Park. A record from Sumatra exists but needs verification. The species is mainly threatened by habitat loss.

Males are about 31–33 mm long; females 45–51 mm. The head is wider than the snout, which is pointed. Fingers and toes have enlarged tips, and the feet are almost fully webbed (the hands are partially webbed). The dorsal skin is smooth, while the chest and belly are granular. Color varies from pale gray-green to brown, with dark crossbars on the back and legs. The sides of the body and inner legs are yellow with black blotches. The iris is brown with a hint of blue.

Males sing while perched on small saplings over streams. Tadpoles live in shallow stream areas under gravel.