The fiddler crab's characteristically asymmetric and much larger 'major claw' has many functions. Males use it for a waving display to win female attention, in combat with other males, and also to dig burrows for their mates to lay eggs in. Naturally, size matters in the crab world!
All my publishers refused to run this one, for understandable reasons, so I thought I'd give it a home on the web. I hope you too have been working on your fiddler claw staying at home in quarantine!