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Some male butterflies insert a stopper into their mate’s reproductive tract – and they use bigger, more effective plugs to stop rivals from mating with females that have a better chance of survival 3 4 Magnetic Drain Plug
A clouded Apollo butterfly Shutterstock / valex61
Some male butterflies plug up their mates’ reproductive tracts to prevent them from having sex with rivals. Now, there’s evidence that they might not be doing so indiscriminately. The type and size of the mating plugs seems to correlate with how much males are willing to invest in their partners.
Males of several groups of animals, such as beetles and water bugs, are known for mate-guarding: sticking around after copulation to keep others away from their partner and increase the chance that they alone will …
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