The knob-billed duck 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 well as most of South Asia and mainland Indochina.
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Low-Light Telephoto Systems
Identifying specific features of the Knob-billed Duck requires high-contrast magnification. Check out the top-rated 8x42 optics.