wraps its presents. Males usually wrap an insect in silk as a nuptial gift, and females often reject males who don’t bring a gift. So some males just find any old thing and wrap it up instead, as researchers reported in 2011: “Dissection of 16 gifts carried by males in the field showed that 62 percent contained fresh prey,
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, while the remaining 38 percent contained empty arthropod exoskeletons,
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, i.e. prey already sucked out,
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, probably by the male itself.” Males that give good gifts get to mate with females longer and transfer more sperm, scientists report October 23 in the Proceedings of the Royal Society B,
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.
6. This fluffy willow seed is pretty, but what am I supposed to do with it?
A fluffy present sounds nice,
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, but this one is just another dirty trick. Male dance flies (Empis opaca) typically give females a gift of a dead insect before mating, but some males cheat. A 2006 study found males swapping out a worthless willow seed for a nutritious insect. They don’t exactly get away with it, though; the cheaters had lower mating success rates than better gifters, the researchers found.
7. Here’s a dead eel,
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, and thanks for all the fish
Researchers studying dolphins in Australia report that a pod of dolphins has been presenting them a variety of prey items. From 1998 to 2012,
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, the team says,
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, dolphins have on 23 occasions offered cephalopods such as squid or fin fish to biologists who had been feeding them. It’s not clear if the behavior is some type of play or possibly related to food sharing.
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