Hi all,
The yellow colouring of the green feathers is typical of a few diseases.
Psittacine Beak and Feather Disease (PBFD) causes patches of yellow but the
young Rainbow Lorikeets affected are usually called "runners" because they
cannot fly. If you saw these up in a tree in a family group they could
probably fly.
Liver disease causes green feathers to turn yellow and can be caused by
nutritional deficiencies. It can be caused by seed-only diet with no fruit
or vegetables in captive birds. In the wild with a family I think liver
disease is most likely in an individual.
I'm doing a bird medicine course this year and researching questions brought
up on Birding-Aus is becoming an interesting challenge.
Thanks
Ian Hackworthy BVSc
Blue Mountains NSW
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