Parrots magazine, the British publication, has a rather good article on commonly raised Pyrrhura species. It's somewhat slanted towards breeding but has a good amount of information on general needs, wild diet and wild behaviors that I found interesting. Individual issues can be ordered from their website http://www.parrotmag.com/.
I bought a subscription and I am liking it quite a bit actually. Bird Talk is less on the hairy edge of "alternative" (sometimes downright "out there") but Parrots is a bit more adult and experienced owner/breeder oriented, if eccentric, in tone.




