Thanks Michael. That's fascinating. I didn't know the bird before now, and now, I not only know it, but am delighted to find this great fact about its sexual dimorphism.
When I click on CarbonAl's ID (Lalange tricolor), I get four pics of birds. Two of these are not the same species as the other two. What is happening? The right hand two appear to be the Lt, but the left hand ones?