yeah i have been wondering a lot about this lately too..
there is the talking/chattering stuff, but there are always exceptions to the rule...
i think i will make a list of what i tend to see as 'mainly' boy traits, and same with girls...
so... there is always the exception, but...
BOYS
-boys tend to look alert much of the time
-boys tend to have narrow hips
-boys tend to stand with their feet close together
-boys tend to have a good tall posture
-boys tend to look interested in any noise that happens/you make
-boys tend to hold their wings up high a lot
-boys tend to stretch their legs out when they stand a lot
-boys tend to stretch their necks up in excitement a lot
-boys tend to whistle and chirp at a young age
-boys tend to try to teach you many random noises
-boys tend to whistle in to things, (like a vase for example)
-boys tend to hop and strut
-boys tend to open their wings a bit when 'nodding'
-boys tend to tap their beaks on things
-boys tend to often make heart shapes with their wings
GIRLS
-girls tend to have wide hips
-girls tend to stand with their feet wide apart
-girls tend to have a slumping, relaxed posture
-girls tend to look bored with any noise that happens/you make
-girls tend to hold their wings down low a lot
-girls tend to relax their legs and 'sit' a lot
-girls tend to not stretch their necks up in excitement much
-girls tend to make two toned calls a lot
-girls tend to ignore a lot of noises you try to teach her
-girls tend to fluff and preen a lot
-girls tend to not strut or hop
-girls tend to hold their wings close to her body when 'nodding'
-girls tend to not tap their beaks on anything
-girls tend to cuddle up into spots a lot
hmmm... i am sure i have missed things... and some things work for both male and female, but the listed one usually more....
dunno though.. just my opinion