I´ve seen these birds in the zoo, they´ve got a brilliant deep blue colour. But this picture doesn´t show the colours as they are, I´m afraid, the strong yellow background makes a rather agressive combination with the blue. Other colours in the picture look washed out. A black and white background might help. I like the composition.
I'm not familiar with what color these birds are in real life, but I had actually just been thinking that the yellow background was rather opportune. It's not quite as intense as a pure complementary scheme, but just enough that both the yellow and the blue are enhanced, especially the birds' yellow feathers.
It is visually appealing too that the pair are caught in the same pose.