Not really a challenge challenge but how about a paleo study. Eg. a prey predator relationship or species/subspecies families or in geographic area of dig sites. Could start off with the species details the game gives you, look up other online resources (or background resources used to make the game) and/or make guesses on how many struthis a T-rex would need to eat per week to stay alive, how much vegetation the struthis would consume, why struthis might live in groups or why natural selection caused dinosaurs to grow big. You might not be 'right' all the time in your guesses but what if you were a paleontologist using JWE dinos for study.