This one breaks a rule:
"Sub-Species Rule
For the purpose of this game there shall be no physical differences in sub-species. If you want a species to look diffrent [sic] in a specific biome then they must replace or split off and become a separate species specified for that environment. Note that this rule dos not effect sexual dimorphism, life cycle metamorphosis or any other physical change that can happen to a species."
Theoretically, if it had mild color-changing abilities, and it just so happened to camouflage itself better in different environments, this would not break the rule.