Humans are included in that group, but the behavior is not a standard part of our reproductive process. The study, published in the journal Biology Letters, adds yet another dimension to the battle between the sexes. To help combat this problem, squid sperm and the sperm of many other animals may contain manipulative compounds that stimulate female reproduction. It appears to happen a lot among squid, the focus of the new study. Species that exhibit this include carrion flies, picture wing flies, a strange marine invertebrate known as Spadella cephaloptera, a type of leech, a marine nudibranch and the southern bottletail squid Sepiadarium austrinum. Humans, again, may swallow sperm, but it's not standard behavior during reproduction.
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