One of the birds we first saw when we were on the Lake Awassa was this Knob-billed duck. It is an unusually heavy and large duck (22 to 30 in. or 64-79 cm), colored in black and white with a plumage that shines in blue and green, depending on the light conditions. What has given it its name is the male's large, black, fleshy knob on the bill (which can become even bigger than the one we see in the picture). It is a widely dispersed duck. It occurs in Africa, sub-Saharan Africa, but also in Asia, from Pakistan, in India all the way to southern China.