Simple -- evolution of course. But new research now suggests that the reason humans and apes don’t look alike in the face is down to facial expressions. We have plain faces, without varying colour and with less hair poking out everywhere, because it helps us track the complex facial contortions we use for communication.
Scientists have found something really surprising and remarkable: wasps can recognise each other by looking at their faces. Until know, we thought that only animals like humans or chimps can do this. Not anymore.