The twin lakes of Ikh-Gun and Ayaga, fed by the Kherlen River, are the ornithological heart of Gun-Galuut. The Kherlen is the longest river in Mongolia and its wetlands here attract migratory waterbirds in enormous numbers during spring and autumn. White-naped cranes, bar-headed geese, and demoiselle cranes are among the regular visitors; the lakes also support resident populations of swan, duck, and wader species through the summer.
The birdwatching is best at dawn and dusk. Ger camps near the lakes will typically arrange early-morning walks to good viewing spots, and the guides have a detailed knowledge of which species are present at different seasons. Binoculars are essential — the reed beds can be extensive and the birds keep their distance.