However, macaques are the most commonly used primate species. Macaques also make up the majority of nonhuman primates imported for research. Other highly imported species include marmosets, squirrel monkeys, olive baboons, vervet monkeys, and night monkeys. Non primates on the other hand often possess smaller brains. But as we learn more about the rest of the animal world, it's becoming clear that non-primates are pretty intelligent too. Some examples include pigs, octopus, and crows. While nonhuman primates don't have obvious cultural traditions the same way humans do, such as variation in their clothing or adding extra spice to their food, primatologists have nonetheless identified behavioral practices that vary between communities and which are transmitted through social learning.