The brilliant orange-coloured chealae of the male of this widespread fiddler crab are distinctive. Across the mudflat, the waving claws look like brightly coloured decaying mangrove leaves swaying in the breeze. The ritualistic waving of the chelae is to repel other males and attract females.

This crab ranges from near Darwin, across northern Australia and south to almost Sydney, New South Wales.

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Lemon-yellow Clawed Fiddler Crab, Uca perplexa

This beautiful lemon-yellow coloured fiddler crab may be found far above high-tide levels on sandy shores. It ranges from the tip of Cape York down the Queensland coast to the Hunter River, New South Wales.

It prefers high shore levels near mangroves in sheltered bays, creeks and river mouths.

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References:

Davey, K. 1998. A Photographic Guide to Seashore Life of Australia.
New Holland press, Sydney.