Made with Xara Web Designer Breeding Marabou Stork Leptoptilos crumeniferus Female Knobbilled ducks Sarkidiornis melanotos Click thumbnail to enlarge Breeding Birds Seasonal Birds These birds are known for having the longest wingspan of any bird in the world. The male of this large black and white duck has a peculiar fleshy black knob on top of its bill which enlarges at the height of the breeding season. The female is smaller than the male and lacks the knob.