By Savithri Singh - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=108403952
Eend
Sources:
(*) https://en.wikipedia.org/wiki/Knob-billed_duck
(*) https://ebird.org/species/comduc2
(*) https://search.macaulaylibrary.org/catalog?taxonCode=comduc2