Male dominance plays a big role in chimp society. Disputes are often resolved by threatening displays or by fighting. Female chimps lead a life much more solitary than that their bonobo cousins ...

The animals have not been used as test subjects since 2015, when the NIH retired chimpanzees from invasive research.

a move celebrated Friday by animal advocates who have been fighting for years to get the animals moved. NIH representatives confirmed in an email that the transfer of the 23 chimps from the ...