Gorillas
Unlike monkeys, gorillas rarely exhibit signs of happiness. They seem to be troubled and sad all the time. The truth is that they are happy creatures too. According to research, when no one is watching, they love teasing each other. They even make pranks among their group. They even know how to use regular toys that human beings use. Perhaps you can compare them to shy, but happy humans. There are these kinds of people too, so it’s not impossible that there are gorillas who also have this characteristic.
