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Crayfish Claws Can Fake Out Attackers, Cherax Dispar Research Shows (Huffington post)
By: Jennifer Welsh, LiveScience Staff Writer
Published: 03/17/2012 11:52 AM EDT on LiveScience
Some crayfish "fake out" their opponents with their gigantic right claws,
suggests new research showing that these big claws aren't always as strong as
they should be for their size.
The slender crayfish, _Cherax dispar_, fights with other males over territory.
They start these bouts of aggression by assessing each other's pincers by
rubbing and tapping them. The male with the largest pincer is usually the
victor of these fight-less facedowns, and so snags the territory, without the
contest escalating further.
"In my experience, most conflicts are settled without fighting," study
researcher Michael Angilletta Jr., of Arizona State University, told
LiveScience in an email. "Usually, the smaller individual backs away very
quickly (often immediately). Escalation to physical combat only occurs when
two individuals are similar in size. I'd estimate that more than 80 percent of
encounters would be settled without combat."
When these meetings do come to blows, the stronger of the two males usually
takes home the belt. If the two crayfish get into a physical fight (one
doesn't walk away in fear of the big claw, and instead they continue
fighting), the winning crayfish ...
Huffington post
