I'd really like to argue that it's probably because it takes more than a glance to realize how intelligent the animals are. We see all the time that even with

I'd really like to argue that it's probably because it takes more than a glance to realize how intelligent the animals are. We see all the time that even with humans, as intelligent as we are, we judge people for how they are constant. I'm sure we ask have encountered people in our lives that as the more we talked to them we realized that our assumptions of them the first we times you meet were wrong. Some people you think are really smart and then it turns out the opposite and vice versa. I would even argue that the opposite is true. Those who do not spend time with these animals and those that do not have pets, often tend to assume the animals aren't very smart because they don't have languages and technology. When there is no shared common language, you must gather knowledge of how smart these animals are by studying their mannerisms, and that is something that can only be done by spending time with these animals. Maybe that's why "the abilities of apes like Koko and Kanzi are overstated by their loving caregivers". The abilities aren't overstated, but understood. Everyone else undrained the abilities because they are not present enough.