The knob billed duck (Sarkidiornis melanotos) or African comb duck is a type of duck found along the tropical sub tropical wetlands and waterways of Sub Saharan Africa and the island of Madagascar, as Knob Billed Duck, (Sarkidiornis Melanotos) : r AIDKE Avise's Birds of the World The knob billed duck (Sarkidiornis melanotos) aka African comb duck, is found in tropical wetlands in Sub Saharan Africa, Madagascar and the Indian Subcontinent from northern India to Laos and extreme southern China. The bird in the image is a knob billed duck (Sarkidiornis melanotos), also known as the comb duck. Nikon D500 + Sigma 150 600 mm #rickyrasaniaphotography #tholbirdsanctuary #nikon #sigma #birdphotography #winter #wildlifephotography #gujarat