The theming and story of Jungola, including the entire Rimbula greenhouse, focuses on 'Jungle Jim', an explorer and birder with a bit of an Indiana Jones and Robinson Crusoe-esque story of going deep into the jungle of 'Rimbula' to explore rumors and myths and look for a legendary monster bird called the "Laya-laya", then crashing his plane into that jungle. Following the crash he survives in the jungle using his skills and the remnants of his plane, and continues doing research, noting his findings in his journals. These "Jim's journals" are a feature of the signage throughout the Jungola section. The Rimbula greenhouse features multiple of Jim's sites and contraptions.
In this arena a show is held, now called "Jungle Jim's test" (previously "Jungle Jim show"), which I did not however seen myself.
I did not myself see Jungle Jim, but this is the character:
With thanks to @Mr Gharial for posting the Jungle Jim story, I based my above paraphrase on his stories, and he also made and posted the photo linked above.
This arena is also the core area for the silky chickens kept in the Rimbula greenhouse - probably one of the strangest animals I have ever seen in a tropical greenhouse.
