On a sunny day in Argentina, an at-risk predator paused to sit along a riverbank. Its cub appeared by its side, and the pair looked across a national park. But they weren’t the only ones looking around.

Stunned boaters noticed the baby animal. It turned out to be the region’s first in decades.

Darío Soraire and Pablo Luna, boat tour guides, took some tourists to a viewpoint in El Impenetrable National Park on July 30 and were boating back upriver when they spotted a pair of jaguars atop a steep riverside cliff, Soraire said in a video shared by Tompkins Conservation.

Immediately, the guides knew they’d seen something significant. They took several photos of the jaguars and reported the sighting to Rewilding Argentina, an organization working in the park.

Conservationists identified the

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