http://en.wikipedia.org/wiki/Siamese_fighting_fish
^_^
I love bettas, and have had them since my first aquarium that I had around 10. I try to keep them in at least a gallon of water, the bigger the better. I don't think it's human to expect bettas to live in those tiny cup tanks that are sold all over the place. And even though bettas can survive with minimum to no filtration, I always keep my tanks filtered. If for no other reason, it keeps the smell down to non existant.
I've owned... oh... about 8-10 of them so far in my roughly 20 years of being a fish keeper.
My new one is a dark blue, lavendar spotted male with curling fins, which are pretty neat. I have him in a Whisper 2.5 gallon aquarium by himself with a plant bulb at the moment. I may add a neon tetra or guppy or two just so his mind will be kept a bit busy.