30 / observation populations liter / land / mammal to the part mind
10_of_population is colour_blind. web_footed_tenrec is mammal. mammals has large_brains most_mammals has two_eyes mammal_eye is vertebrate_eye. mammal_auditory_system is body_part. most_mammals has voice mammal_eye is body_part. prototheria is mammal. populated_area is site.