Ugo Mellone / Biologist Kini Roesler, coordinator of the Hooded grebe Project for Aves Argentinas NGO, working on laptop with picture of Hooded grebe on wall in background, Patagonia National Park, Santa Cruz, Arge...

Ugo Mellone / Researcher / field worker from Aves Argentina NGO placing a floating trap for invasive American minks at edge of river, Patagonia National Park, Santa Cruz, Argentina, December 2017.

Ugo Mellone / Researcher / field worker from Aves Argentina NGO monitoring Hooded grebes (Podiceps gallardoi) in Strobel plateau, Santa Cruz, Patagonia, Argentina.

Ugo Mellone / Two researchers from Aves Argentina NGO collecting eggs abandoned by Hooded grebes (Podiceps gallardoi) for captive breeding, Hooded grebe colony in background, Strobel plateau, Santa Cruz, Patagonia,...

Ugo Mellone / Researcher from Aves Argentina NGO in lake collecting abandoned eggs from Hooded grebe (Podiceps gallardoi) colony for captive breeding, Strobel plateau, Santa Cruz, Patagonia, Argentina.

Ugo Mellone / Researcher from Aves Argentina NGO in lake collecting abandoned eggs from Hooded grebe (Podiceps gallardoi) colony for captive breeding, Strobel plateau, Santa Cruz, Patagonia, Argentina.

Ugo Mellone / Researcher from NGO Aves Argentina monitoring hooded grebes (Podiceps gallardoi) from his campsite in Buenos Aires plateau. Patagonia National Park, Santa Cruz, Argentina.

Ugo Mellone / Researchers from Aves Argentina NGO monitoring Hooded grebes (Podiceps gallardoi) in Patagonia National Park, Santa Cruz, Argentina.

Ugo Mellone / Man processing fish following trout eradication attempt. Introduction of non native trout (Salvelinus sp) to lakes where Hooded grebe colonies breed is one of the major conservation threats for this c...