Female bees and wasps are the real defenders. Only females can sting, because stingers are modified egg-laying organs. Males do nothing in defence. Females guard nests, food, and colonies with extreme ...

Snakes vary in size, from the tiny size of the Barbados thread snake to the massive reticulated python. Sizes also vary ...

The human genome is a rich, complex record of migration, encounters, and inheritance written over thousands of millennia. Genomic research by members of Sarah Tishkoff's lab at the University of ...

Genetic evidence hints that there was a strong bias for male Neanderthals and female humans to mate, rather than any other combination ...

When ancient humans interbred, new research shows that the pairings were predominantly male Neanderthals and female Homo sapiens.

Genes are short sections of DNA that determine an animal’s traits—everything from coat color and claw strength to body shape ...