African gray parrot, tiger salamanders, asshole gecko (tokay), and a bunch of aquatic animals like crabs, crayfish, and fish.
I used to be really big into aquarium fish breeding. If it was new to the hobby, I'd buy them and see if I could breed them. My biggest accomplishment with pets is I used to breed Darwin clownfish.
I currently have some redtail splitfin goodeidae fish. They're from Mexico, and are endangered. Years so, hobbyist from Europe noticed the populations were declining, and took it among themselves to collect specimens, and breed them. They're not super rare in the hobby, but you're not going to walk into petsmart, or even your local mom-and-pop store, and find them for sale.