Chimps 'can smile like humans'

UK researchers say a study looking at chimpanzees facial expressions may explain the evolution of human smiles.

UK researchers say chimpanzees have the same types of smiles as humans when laughing.

CHIMPANZEES have the same types of smiles as humans when laughing and do not even need to make a sound to be understood, according to a new study.

RESEARCHERS from the University of Portsmouth say that chimpanzees' communication is more similar to humans than was previously known as they are able to produce these smile types silently without being constrained by the accompanying laughing sound.