The species Calumma cucullatum has got a huge native range. The species is just extremely rare in their native habitat. That is similar to Furcifer bifidus. That is another species that has got a huge native range and is just a rare chameleon in their native habitat.
You added one. Calumma amber is a neat Occipital Lobes Calumma species too.
Best Regards
Jeremy A. Rich