Instead of penises, male sharks use two claspers to get sperm into females. And about 15 shark species can have young without males, with females self-fertilizing eggs. This is known as ...

The caterpillars are called loopers as they only have two pairs of claspers and so arch their bodies and loop along when travelling. Many resemble twigs and so avoid their predators. Please submit ...

A male banded demoiselle damselfly (Calopteryx splendens) grips a female with his tail claspers—which male damselflies often do to coerce females to mate with them. If you’ve ever spent time ...

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