Thanks guys for very helpful replies. :D Usually I've only collected pets because I like having one following whatever toon I'm currently using. I usually rotate through the list each time I log in. It's taken me quite a while to get used to the battle pet concept and these answers are very helpful ...

G'day All :? There's something I've been wondering for a long time but have not been able to find an answer for: Whenever I hover over a pet running wild a text box comes up saying "collected 1 of 3" as an example. Can anyone tell me why? Is there a reason to collect three of every critter? I'm just...