Ha ha ha!! A Beta fish is a japaneese fighting fish. You can only have 1 in a bowl because they will kill each other. They are pretty small, abou the size of your every day gold fish, but very beautiful. They come in many different colors, ranging from blue to red to white. It's really fun, and maybe a bit cruel, to put a mirror up to one. They get all fiesty and puffy. It's cute!