Very young quakers have a soft beak especially on the sides at the base of the lower mandible, more green and less grey on the hood, and less pronounced barring on the breast. Some quakers maintain this baby body language much longer than others, some revert to it occasionally even as adults when they are courting, ill, or otherwise needy. Highly social and eager to please, domestic quakers usually love to be cuddled. They learn to play dead easily. Individual males tend to masturbate often, sometimes sounding more like a threatened viper than a little green and grey bird.
Domestic quakers are reportedly easy to potty train.
Handfed domestic quakers often rival African greys in their ability to acquire huge vocabularies. Quaker sounds can be so repugnant, interlopers flee just so they don't have to hear the noise. On the other hand, wild quakers are sometimes tolerant, even accepting of the presence of certain other species, often allowing opossums, bats, and geese to occupy their huge communal nests. This tendency is especially pronounced in the quakers's tendency to bond too strongly to a cage or territory. I do not insist that a quaker come out of the cage on my hand.