those small green parrots might be conures
cockatiels are good pets...male ones talk more than the girls
and as mentioned before if you have a pair,
they will bond to each other and not often to you.

a bird is either a breeder or a pet, rarely both.

hand raised birds respond to humans more than others.

I have had parrots, cockatiels, canaries, finches, and other birds.

by far the cheeriest were the canaries..their songs have brightened

my days on many occasions...
(finches and canaries are seed eaters and are quite easy to care for)
they are not the type of birds that prefer to be handled...
usually the "hook bills" are more into that type of human interaction
(budgies, parrots, etc.) most of these critters prefer warm quarters
and in the cold months you may need to take extra care, as many are form tropical environments..at least their ancestors were...
you might want to subscribe to Bird Talk magazine..
http://www.birdchannel.com/bird-magazines/bird-talk/default.aspx