Haha. After reading everyone's posts about their bettas, I still don't understand how people can be content to house them in cramped, unheated jars. They miss out on seeing so much of their fish's personality.
The funny thing is, he only jumps when he sees a human face. The cats drink out of his tank all the time and he just swims over and watches. I have to tell people not to put their fingers in because he does bite, and then kind of latches on.
For whoever asked how big the tank is, it's 60 x 18 x 30cm so around 8 gallons. I like how long and shallow it is - it gives Brighid room to do his 'Jaws' impersonation.