Sometimes cougars are not nocturnal, because they need to be active at the time time their prey is active. For instance, deer are active at dawn and dusk, so a mountain lion that feeds on deer with adjust its schedule to match the deer's. They also emit birdlike whistles, which are probably used to communicate where they are and instructions between a female and her kittens. One of the great mystery's about cougars is their fear of barking dogs. It is hypothesized that sometime in the cougar's evolutionary past they were preyed upon by barking animals.
Mountain lions do well in captivity and have been bred successfully in many zoological gardens.
They become tame easily, and have been trained to perform in motion pictures and circus arenas.