What are zhu zhu pets?

so far, there are 40 of them: mr.squiggles, pipsqueak, num nums, chunk, patches, scoodles, Jilly, nugget, winkie, cappuccino, peachy, jinx, yo-yo, moo, Tex, ROCKY, spottie, pinkie, dezel, bamboo, hank, captain zhu, fluffy, Carly, Ryder, pax, Kingston, Roxie, Rocco, sweetie, stinker, zu zu, and the ninjas count too: stonewall, rock'o, rivet, sgt.serge, drayko, yama, azer and thorn

I think the top 5 best hamsters are: yama, drayko, stonewall, num nums and sweetie.