Portal:Birds/DYK/4


 * ...that sexual size dimorphism in the brown songlark is among the most pronounced in any bird, with males as much as 2.3 times heavier than females?
 * ...that rufous whistler birds, unlike all other whistler birds, never forage on the ground but high up in trees or other high places?
 * ...that the bill of the magpie duck (pictured) becomes green as the bird gets older, and its black crown may go completely white?