How yellow and blue make green in parrots Date: October 5, 2017 Source: Cell Press Summary: Many brightly colored birds get their pigments from the foods that they eat, but that's not true of parrots.

[+] yellow-shouldered Amazon parrots, Amazona barbadensis, are mainly found on the Macanao peninsula (the land mass on the west side of Isla Margarita.) (Creative Commons CC0 1.0 Universal Public ...

And it is this level of commitment that I think help justify the orange-bellied parrot as a special case. Some think a failure to increase the population over 30 years as a failure.

How yellow and blue make green in parrots. Cell Press. Journal Cell DOI 10.1016/j.cell.2017.08.016 ...