Why guppies have genital claws
New research from evolutionary biologists at the University of Toronto shows that the male guppy grows claws on its genitals to make it more difficult for unreceptive females to get away during mating.
Guppies and sexual conflict? It's a genital arms race
(Phys.org) —It's not always easy to tell if a fish is male or female: they look more or less the same. But there are exceptions, such as guppies and, as with humans, guppy genitalia varies in size across ...
Jurassic insect that mimicked ginkgo leaves discovered
Male competition over females: An evolutionary engine of genital evolution
When a female mates with several males, these will compete over the fertilization her eggs. This is an important evolutionary force that has led to the evolution of a diversity of male sexual organ morphologies. ...
Velvet spiders emerge from underground in new cybertaxonomic monograph
Velvet spiders include some of the most beautiful arachnids in Europe and some of the world's most cooperative species. Social species can be very abundant in parts of tropical Africa and Asia with conspicuous co ...
Discerning males remain faithful
Discerning males remain faithful ... if you are a spider. Sex for male orb web spiders (Argiope bruennichi) is a two shot affair since the act of mating destroys their genitalia. If they survive being eaten ...
Duda, where'd my spines go?
UC researcher finds that when it comes to hooking up with the opposite sex, genital complexities do matter.
Researchers reveal secrets of duck sex: It's all screwed up
Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that thwart oppositely ...
Genital stimulation opens door for cryptic female choice in tsetse flies
Manipulation of male and/or female genitalia results in a suite of changes in female reproductive behavior in tsetse flies, carriers of African sleeping sickness.