Dark Matter Might Be Complex or Just One Particle?

Why do we think dark matter is just one kind of particle? Right? Our matter is many, many kinds of particles. We have different kinds of corks and leptons that do all sorts of crazy stuff. If you're gong to go that way, then you can say, well, dark matter might be more complicated. That's like most detail worked out possibility. The rest of it is just sort of speculation. You know.