Possible Clues:

• Andean lake
• World's highest lake, between Peru, Bolivia
• Two-part lake connected by the Strait of Tiquina
• Songbird on thorny tree almost tipping over into lake
• Small bird, one seen round about high water
• Small bird with short wattle, perhaps, over high lake
• Large lake on the Peru-Bolivia border
• Incas' origin, in their mythology
• Largest lake in South America, highest lake in the world
• South American border lake