I would like to create a little room here for the wonderfully unexpected, beautiful,... (add your adjective) in Nature. Unexpected and/or beautiful could be interpreted as curious/spectacular, or similar.
I mean to use these examples in order to keep the kids interested in Nature. The youngest ones get bored very easily. Examples could be: a rare animal, plant or protist, an almost unbelievably beautiful geological phenomenon, an amazingly complicated molecule that looks like a tinker-toy a