describing the psychological practice of studying bears within their natural habitat. (Bear) the term to describe the subgroup in homosexual culture identified as a heavy set physical appearance; body hair and facial hair. The natural habitat of the bears is:
Pubs, clubs, eating establishments.
For true enthusiasts night vision cameras are employed to observe said bears in darker environments e.g. dark rooms, saunas and badly lit cruising areas.
That Greg has been studying those guys for ages, I'm sure he is studying bearology