[Caution! This is, of course, a spoof.]
Top Tier Birder - Life List is comprised of 7 1/2 species not yet seen
Extreme Birder - Intense!
Serious Birder - Extensive knowledge and generously shares it.
Avid Birder - Enthusiastic and very knowledgeable.
Enthusiastic Birder - Long on enthusiasm, short on knowledge.
Recreational Birder - Owns binoculars, comes because there are cookies.
Book Birder - Birds in fabulous reference books and guides. Doesn't leave recliner chair.
Beginning Birder - Potential to become Serious or Extreme Birder, or better.
Casual Birder - Interested, borrows Aunt Mabel's ancient 6 lb binoculars.
Accidental Birder - Trips over the bird.