what are the groups (A to E) representing? I'm sure I've been told on another thread before, but I can't remember (although I do have the word "arbitrary" floating around in my head). Further, how are there two new groups since the last book and what are they for?
The groups are as follows:-
A:- 1,000,000+ visitors annually
B:- 500,000 + visitors annually
C:- 250,000+ visitors annually
D:- EAZA candidate zoos
E:- German medium sized zoos