don’t have blood per se,
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, but instead have a circulatory fluid called hemolymph that sometimes becomes a nuptial gift. A female southern ground cricket chews off a specialized spur on a male’s leg and sips his hemolymph through the opening. A study published in Ethology earlier this year showed that the gift increases the number of eggs females lay by more than 40 percent,
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, suggesting it provides a nutritional boost.
11. Well,
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, I did enjoy that monkey meat …
Female chimps are more likely to mate with males that share meat from colobus monkeys and other animals that the chimps hunt down as packs. “Our results strongly suggest that wild chimpanzees exchange meat for sex on a long-term basis,” anthropologist Cristina Gomes told Science News in 2009. It’s not an immediate quid-pro-quo exchange,
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, but males that bring home the monkey meat are playing the long game.
12. Blood saves lives,
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, so regurgitate some today
Vampire bats need to eat blood to survive,
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, and skipping just a few meals could kill a bat. This year researchers reported that vampire bats not only regurgitate blood for starving roostmates, they offer blood to nonrelatives. Such acts of altruism that don’t benefit an animal itself or gene-sharing relatives are uncommon in the animal world. But as we can see from this list, sometimes it’s better to give than to receive.

Dust still lingers in the leftovers of a supernova that exploded thousands of years ago. Its existence demonstrates that the material can survive the reverse shock waves of stellar explosions,
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, researchers report online March 19 in Science,
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.
Ryan Lau of Cornell University and fellow astronomers found the lingering dust in Sagittarius A East, a remnant of a supernova 26,000 light-years away that exploded (from an Earth-based viewpoint) 10,000 years ago.

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