I think this set of articles should be mandatory reading for anyone planning on having more than one birdie, regardless of what type. I'd read this set of articles almost 2 years ago, but refer back to it now and then to assure myself I'm not completely insane. The Introduction, then parts I, II, & III are excellent, even if a tad dated. The rest is great info as well.
http://www.cockatiels.org/articles/behavior/behavior.html
Quite unfortunate their message board died from becoming closed, but hopefully their library will remain open.














