It worked!
The easiest way to tell them apart is there beaks. For example in the first image, from left to right, Luna (Female), Venus (Female), Sol (Male).
Luna's got a nice dark beak, sort of fawn coloured back, white belly.
Venus beak a little paler, Darker fawn all over with a black butt.
Sol's beak is really washed out and pale, and just all around pretty pale.
Love there little guys. Just rearranged the cage and apart from a short stint chilling out in the veg bowl all seems well.
