Not only do Oustalet's get big but they're also pretty active. The bigger cage, the better. When it comes to food, they're not picky at all and, in fact, seem to eat more, proportionately, than other chameleon species on a daily basis. While they can get quite large, they're still happy to eat medium to large sized crickets. When it comes to temps, it's hard to say what's best, in my opinion. Unless you know the locale, Oustalet's really shouldn't be considered a "desert" species because it is so widespread. They're found side by side with panthers in Ambanja, Ambilobe, etc. on the west coast and makes sense that collectors would be bagging those as well as the panthers. I've had some that were fine outside down into the 40's while others that seemed to wilt below 60F at night. All in all though, I've always thought they're a really hardy species.