tiel did this.

Reptilian half (legs and underside of the tail) are always the same regardless of gender or mood, Deep black and green fade/speckles with pale bellyscales.

However, the avian half's colors and patterns change based on gender/mood.

Male/dominant side - http://macaw.pbworks.com/f/Scarlet\_Macaw.jpg

Female/Gentle side - http://1.bp.blogspot.com/\_DRocE4m2E3g/TFYergWmJCI/AAAAAAAADUg/jHAhAok5hWw/s1600/green+macaw.jpg