Perceptive analysis, Bob, but your taxonomy of birders doesn't address a key 
question -- do the different "species" hybridize?

Maybe we should develop a birding equivalent of the Myers-Briggs typology 
test, to help people find compatible birding companions. The codes might 
include "L-W" (Lister or Watcher), "C-B" (Cameras or Binos), "O-D" 
(Obsessive or Dilettante), and "S-G" (Solo or Group birder), among other 
possibilities. Just imagine how much aggravation you could avoid by knowing 
in advance that your field trip leader is, say, a WCDG, when you're an LBOS.

I offer the usual disclaimer that this is proposed humorously, unless 
somebody wants to help me really do it!

Janet Millenson, WBDS
Potomac, MD (Montgomery County)

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"Look at the birds!" -- Pascal the parrot