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in this case...ceres might not help yet...that blue baby is YOUNG
the blue budgie still has its forehead barring, as they mature the baring on the face receeds backwards...
like
the grey looks like a slightly older male (still too young to be in breeding color though) look on the back of his head, is there black bars (like in that above picture) if so hes a little bit older than the blue and looks dark enough to be male.
if theres NO barring howver you have a whiteface and there a little harder to age (whitefaces don't get the barring) and in that case like the blue it could go either way.
in the case of youngsters you can still sex based on the ceres (the area around the nostrils)
both males and females will have a blue tint, BUT, females will be WHITE and blue and males will be PINK and blue (or more uniformly blue all over)
if that's the case based on those pictures your grey is a male and your blue is a YOUNG female not yet through her first adult moult...
but given they are young its impossible to guarantee that without DNA.
There are DNA services online where you can pluck a feather, send it in, and they will sex your bird.
Please do not allow someone to surgically sex your bird.
Is there a reason you need to know?
Birds don't have be sexually sexed these days. An avian veterinary technician can draw a sample of blood from the birds' toenail, send it off to a special lab somewhere to have it DNA-gender tested, and then either call or email the bird's owner with the results. That's how I had my pet Congo African Grey Parrot, Aziza DNA-tested. The results came back a week and a half later; she's a female, who's now 6.5 years old.
It would look like my bird's would get real tired standing on their wooden rod 24 hours a day? Would a nest work?
Skip the nest, and put in a corner platform instead. Also put in a second perch that has a larger diameter (or even better, one that has a variable diameter, like a natural branch does). That way your birds can rest their feet by changing where they perch, as the differing perch diameters will put pressure on different parts of their feet.
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