. Spermatophores: sperm and a nutritious meal all in one
Fireflies don’t eat as adults,
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, so nutrition is the best gift a female firefly can get during breeding season. Luckily male fireflies, like many insects,
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, produce sperm packages called spermatophores that contain both sperm and much-needed nutrients. Males give the packets to females as a nuptial gift, meaning it’s related to mating. In the case of fireflies the spermatophore is decorative too, shaped like a coiled spring. In 2012 researchers reported that the mating success of Photinus greeni fireflies depends largely on presenting females with a large spermatorphore.
2,
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. Cyanide for you and your children this holiday season
In six-spot burnet moths,
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Zygaena filipendulae),
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, male moths transfer cyanide-producing compounds to females. The poison is hard to make and comes in handy; females use it for their own defense and store some in their eggs for larvae to use later. In November, researchers in Denmark reported that male moths throw a stocking stuffer into the transfer, giving females a compound, 5-hydroxytryptophan glucoside,
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, that may cause females to copulate longer and delay egg-laying, which reduces the odds she’ll mate with another male.?
3. Voles on a stick
Some birds give food gifts just before mating,
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, and birds called shrikes takes it a step further by making those gifts into kabobs. The birds impale insects or smaller birds or mammals on sharp sticks or thorns to hold them in place as the bird dismembers them. Great

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