Under attack
Chimpanzees exaggerate their screams when under attack, according to St Andrews researchers.
Chimpanzees exaggerate their screams when under attack, according to St Andrews researchers.
Female chimpanzees can be as violent as males, shattering the stereotype that males are more aggressive.
CAPTION: Liberius, a five year old male chimpanzee, made different grunts to convey different types of food. CREDIT: Katie Slocombe.