Laughing Is a Social Tool for Mammals

Professor scott says, laughter is an important social tool for all mammals. Even rats tickle each other and make squeaky noise like laughter when they play. By laughing, young mammals signal that they want o play. And young rats who don't laugh back are more likely to get a bite than a giggle. What a lot of facts we've learnt about laughter. Six minutes english from the b, b, c, world service programme.