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Dr. Walschburger stepped right through them as savanna hawks and caracaras, two common birds of prey on the llanos, swooped excitedly over the smoldering pasture, hunting escaping rodents and reptiles.

But travel to the Falkland Islands near the Argentine coast, and you’ll find not parrots or crows but freakishly smart falcons called striated caracaras.

The image shows two crested caracara birds, on a tree branch in southern Texas, USA.

For two decades, he has recorded as Shearwater; last year, he released his first book, a kind of personal history of the “world’s smartest bird of prey,” the caracara.

He pointed out wild llama-like guanacos grazing on the steppe, a gray fox running across the road, and caracara falcons perched on the fence posts.