The seep frog or Balu oriental frog (Occidozyga baluensis) is a species of frog in the family Dicroglossidae. It is probably endemic to Borneo. Range Occidozyga baluensis is found in northwestern Borneo (Sarawak, Malaysia, Brunei, and Kalimantan, Indonesia) and was also recorded once in Lampung, Sumatra, although the latter is questionable. Its name refers to its type locality, "Mount Kina Balu, North Borneo". Description Occidozyga baluensis are small–medium-sized frogs. Males grow to a snout–vent length of about and females to . Dorsal colouration is variable, brown, grey, or olive, sometimes with dark markings. Some individuals have a vertebral stripe. The belly is cream with an abundance of brown spots. Tadpoles have a long tail with low tail fin; the tip is pointed. The mouth is terminal in position and the orifice appears quite small. Habitat Occidozyga baluensis inhabit shallow ponds or water-filled depressions where clear water seeps out at the base of a slope. Tadpoles live in the shallow water film that covers the leaf litter in seepage areas. They are predatory and ingest small invertebrates. The species is threatened by habitat loss caused by clear-cutting. References External links Sound recordings of Sleep frog at BioAcoustica Occidozyga Endemic fauna of Borneo Amphibians of Brunei Amphibians of Indonesia Amphibians of Malaysia Amphibians described in 1896 Taxa named by George Albert Boulenger Taxonomy articles created by Polbot Amphibians of Borneo