Yes, the percentages are about the same too. https://www.washingtonpost.com/news/to-your-health/wp/2015/05/12/95-percent-of-parents-think-their-overweight-children-look-just-right/ The explanation for this case is fat normalization, but such a case cannot be made for animals. The majority of animals you see (outside or on TV) are normal. I think it's just that in general people tend to think of themselves and their things/habits/behaviors as normal and average, regardless of how outrageous and out of normal they are.