The geometric earthwork structures, carved into the ground with embankments and ditches, are in some cases more than 2,500 years old, researchers said.

Hundreds of camera-trap records from Bolivia and Peru suggest the short-eared dog (Atelocynus microtis), one of the world’s least-known canids and one of Latin America’s least-known carnivores, may be thriving in intact upland forests.

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