Azure bluets form dramatic 'MATING WHEEL' postures in copulation — the male grips the female's neck while the female bends her abdomen forward to retrieve sperm from the male's secondary genitalia at the base of his abdomen.
Bed bugs reproduce by 'traumatic insemination' — the male stabs his hardened genital structure directly through the female's abdomen.
The Sateré-Mawé people of Brazil weave hundreds of live bullet ants into gloves and wear them as part of a manhood ritual — twenty separate sessions over years.
Diving bell spider males are larger than females — a reversal of the typical spider pattern, possibly because males spend more time swimming and need bigger air reservoirs.
Male jumping spiders perform species-specific dance choreographies so elaborate they're used to identify species.
Females are ovoviviparous — eggs hatch internally and they give birth to about 60 live nymphs at a time.
Females are 2-3× larger than males. Only females do the full flower mimicry — males are smaller and less elaborate.
