When my boys are sitting on my hand and relax or are falling asleep, their feet get warm.
I've heard they get warm when they're ready to poop, but my guys can poop with cold feet too....
2 Budgies, 3 Cockatiels, 6 GCC'S, 2 Crimson Bellie Conures, 9 Sun Conures, 2 Major Mitchells, 12 Eclectus parrots of various ages, 2 BF Amazons, 2 Hahn's Macaw's, 1 Red Tail Black Too
I have also noticed the same, because often i will pick up a baby to feed & their feet are really hot & other times very cool. But it doesn't coinside with pooping. Not to sure about the contentment either. It can happen at anytime.
I used to worry they had a temp. but ruled that out.