Scientists found out that chimpanzees will opt to delay gratification and wait for food to be cooked rather than eat raw food immediately.

A series of studies have been conducted to explore the chimps' understanding on the concept of cooking at the Tchimpounga Sanctuary in the Republic of Congo. Out of the 9 tests, results have proven that the monkeys prefer eating seared sweet potatoes and were willing to wait while they roam around the experiment area, than eat raw ones that are already available.

Published in Proceedings of the Royal Society B, studies say that chimpanzees have a slight mental capacity to cook, have enough understanding for the need to wait for food to heat up, and can appreciate the difference of a cooked meal over the uncooked.

Although the chimps weren't able to produce fire during the experiment, researcher Felix Warneken, a developmental psychologist at Harvard University tells Reuters that when given enough heat, the chimps "might be quite able to manipulate (it) to cook."

A previous study proposed by another Harvard researcher, Richard Wrangham, almost a decade ago stated that just like chimps, australopithecines have also "found a way to use fire to cook food."

Live Science explains that 4 million years ago, genetic evidence has shown that the "relative size of the chimp brain matches most of our extinct relatives, for a long time suggesting our ape cousin might be an ideal place to glimpse humanity's origins."

"Emotionally and socially, the psychology of chimps is very similar to humans," Atlanta's Emory University's primatologist, Frans de Waal said in the website. De Waal added that the biggest difference between the human and animal species is on how each interacts. Monkeys can't learn languages as fast as a child can.

Aside from cooking, monkeys, just like humans, get drunk on alcoholic beverages too. BBC has a documentary about these animals getting drunk, scavenging alcoholic drinks at a bar.