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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!

Article

The Design of a Beautiful Weapon

September 2013

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A screenshot from the video showing a fiddler crab with a large claw.

Video

Claws Out: Fiddler Crabs Do Battle

September 2013

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A female (top left) and male Photerus annecohenae. Note that females are larger than males (sexual dimorphism) and that males have bigger eyes.

Article

You Light Up My World!

February 2017

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Male northern elephant seals face off for the best beach territory for mating season.

Photo

Elephant Seals Tussle for Territory

May 2012

A male mudflat fiddler crab (Uca rapax) waves its huge claw to impress females and threaten competitors.

Photo

The Mudflat Fiddler Crab

January 2010