nature study(n = noun.cognition) - the study of animals and plants in the natural world (usually at an elementary level);
is a kind of enquiry, inquiry, research

animal nature, brown study, by nature, case study, child study, course of study, double-blind study, evil nature, field of study, good nature, home study, human nature, ill nature, inner nature, law of nature, literary study, motion study, nature, nature worship, quick study, second nature, state of nature, study, study hall, time and motion study, time study, time-and-motion study, time-motion study, work study