Hole-in-the-head Frog (Huia cavitympanum)

The Hole-in-the-head Frog (Huia cavitympanum) is the only amphibian in the world which is known to be capable of communicating with purely ultrasonic calls, beyond the range of human hearing, and it has a recessed eardrum built specifically for this purpose. It is endemic to clear water streams in Borneo. Mulu National Park, Sarawak, Malaysia (Borneo).

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