Interestingly, each crab had its own technique for styling its hat made of sponge—an act that presumably repels predators
The team chose melamine sponge material—the same stuff in household cleaning erasers—because it’s easy to get and sinks in seawater. Then, they set up experimental tanks in which they offered 38crabs three different sizes of foam, videotaping what the animals did with them.Please be respectful of copyright. Unauthorized use is prohibited.Please be respectful of copyright. Unauthorized use is prohibited.Please be respectful of copyright. Unauthorized use is prohibited.
The video footage revealed the crabs spent a lot of time on their hats: An average of 50 minutes cutting the right-size chunk from the foam piece, and as much as five hours carefully digging out the hole their body would eventually fill, according to the research,Generally, this all happened late at night, which may be an adaptation to avoid daytime predators.
“When the crabs become larger than about [nine centimeters], they abandon choosing the sponge,” Kagaya says in an email. For instance, spider crabs similarly attach camouflaging materials to their carapaces through a set of maneuvers and can adjust what they use, but in their case, “if anything ‘goes wrong’, they just go back to the starting point and try again,” she says.
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