Check these bathing dudes out (can you call monkeys dudes?)!
From Wikipedia:
Intelligence and culture
The Japanese macaque is a very intelligent species. Researchers studying this species at Koshima Island in Japan left sweet potatoes out on the beach for them to eat, then witnessed one female, named Imo (Japanese for yam or potato), washing the food off with river water rather than brushing it off as the others were doing, and later even dipping her clean food into salty sea water.[47][48][49] After a while, others started to copy her behavior. This trait was then passed on from generation to generation, until eventually all except the oldest members of the troop were washing their food and even seasoning it in the sea.[47][48] She was similarly the first observed balling up wheat with air pockets, throwing it into the water, and waiting for it to float back up before picking it up and eating it free from dirt.[48][49] An altered misaccount of this incident is the basis for the "hundredth monkey" effect.[50]
The macaque has other unusual behaviours, including bathing together in hot springs and rolling snowballs for fun.[48] Also in recent studies, the Japanese macaque has been found to develop different accents, like humans.[51] Macaques in areas separated by only a few hundred miles can have very different pitches in their calls, their form of communication. The Japanese macaque has been involved in many studies concerning neuroscience and also is used in drug testing.[citation needed]
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