The research could change our understanding of the female anatomy.
Although poor reproduction rates have been known to affect individual species in the past, this is the first time such low reproductive rates have been seen at every stage of the ecosystem.
This type of mating behavior, where a generation of males die off in their first season, is very rare in the animal kingdom.
Scientists hope their theory could one day pave the way for new ways to prevent cancer.
Female jumping spiders produce fluid with four times the amount of protein found in cow's milk.
"Nobody really knew it was possible—but it worked magnificently," the couple's fertility doctor said.
This remained true even when the gorilla cared for kids that weren't his own.
The research could one day be used to help human same-sex couples reproduce.
Scent is thought to play an import role in who we find attractive.
Researchers suggest that the older females may be seducing the males with pheromone signals.
The data for this study was actually collected nearly 20 years ago as part of a regular federal survey.
This particular species of worm, Auanema rhodensis, has three possible sexes: male, female and hermaphrodite.
Some of this behavior may sound familiar.
As they age, fathers pass on more genetic mutations to their offspring than mothers.
Long-standing debate of why women become infertile many years before death edges ever closer to being solved.
Side effects, drugs companies and societal roles all play their parts in holding back alternative forms of birth control.