TheWorlds Rarest Birdsinternational photo competition by the World’s Rarest Birds project was announced last month.
Profits from sales will go to BirdLife Internationals Preventing Extinctions Programme to help support conservation projects worldwide.
A fish-eating duck restricted to a few fast-flowing rivers in central Brazil and north-eastern Argentina.
The breeding population is about 1,220 pairs, and decreasing, most in a single colony.