I don’t think the person who wrote this knows squat about animal behavior, because I’ve talked to folks who train and handle the big cats, and the one thing they all mentioned is that all of them have senses of humor. Hell, look at YouTube for examples of where the cats are playing games and pouncing on each other, stalking, and all of that sort of thing.

Most animals that raise their young for any length of time have socialization skills and a capacity that has to be described as “senses of humor”, or they’d eat their young about the first time that tiger cub stalks and “kills” their mother’s tail-tip.

The authors other points are probably relatively accurate, but when you find an example of something so specious and ill-researched, you start to question the validity of everything else they write.