First: check how many friends you have on Facebook. Next: ask yourself how many of them you consider to be ‘real’ friends? According to Dunbar’s number, we can only maintain about 150 meaningful relationships at one time. And you can probably count your closest friends on one hand. Your social brain Robin Dunbar has spent nearly 50 years studying primates. Back in the 90s, he looked at the relationship between group size and brain size […]
Most animals do it. You’ve been doing it since before you were even born. And it’s quite likely looking at these photos has made you do it now. Yawning. But why do we yawn and why is yawning so contagious?
Chimpanzees use blades of grass to ‘fish’ for termites, and capuchin monkeys use a hammer and anvil to crack open nuts. A mandrill has even been seen using a stick to get dirt out from under his toenails. We’ve known for a long time that other primates use tools but how about animals that aren’t our close relatives?