My sister brought this up not me.

I have two female parrots that are housed together and the Quaker sometimes crouches next to the Sun conure where the Sun conure will preen her head and such.

My sister noticed this behavior, too. Except she noticed that Nikki was just Crouched under sunny and Sunny kind of sat there with her, her head over Nikki, as if looking after her My sister says that there is something wrong with them. I told her that they are just in love with each other.

What do you think?

If everything else they are doing is fine ie eating well drinking playing and active then its probably pretty normal.