All fingers and thumbs Anup Shah / Getty
An opposable thumb is supposed to be a sign of a sophisticated species. But apes called bonobos make little use of their thumbs when they hang from tree branches – even though we use ours to keep a tight grip.
are our closest living relatives, along with chimpanzees. We are all descended from the same common ancestor, so studying bonobos can give us clues to what that common ancestor was like.
at the University of Kent, UK and her colleagues studied bonobos living at , a zoo in Antwerp,…
