Comment by zimpenfish

If you only wanted "highlight" animals and plants, you could probably get away with a list of 150 (or less - I'm struggling to think of 150 off the top of my head) but they definitely wouldn't be as easily distinguished as the Pokemon.

Found the study - they used 100 common species.

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.477...