Females have ridged elytra (males have smooth) — the ridges are thought to provide grip during the species' notably long underwater copulations.
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.
