by Wolf » Thu Dec 10, 2015 9:25 am
I can only see the front of one of your birds in the picture but it appears to resemble the Antipodes Green Parakeet the most. This is one of the Kakariki sub species and the beak color marks this one as a juvenile.
Although it is nearly impossible to visually sex most juvenile parrots of most species, the adults of this species can't be conclusively sexed without the use of DNA testing due to their resembalance to each other.
The male has a larger beak and a broader and more rounded head and that is the only difference so if you have an undersized male you would think it is a female. Apparently undersized males are not uncommon with this species.