Met a guy who's into observing birds ( the tweet tweet kind ) today and apparently;

The Bird Watcher - The lowest of the low, scorned upon by those who really know what they're doing. Wear their binoculars with the lens covers on..pah...amateurs

Birders - Not obsessive mind, but know what they're doing and know a fair bit about the game. Not obsessive like the -

Twitchers - These guys will travel hundreds of miles to get a glimpse of a rare bird

Ornithologists - The Pros. Expert biologist.

I stopped short of directing him to this thread or talking about the difference between 24/7ers and kinksters though