Native American Hunting Pits

Craig Mathews has a wonderful blog about Fishing and Yellowstone Conservation. He posted this photo and this description on his blog, “I drove into the Park to fish. [...] we hiked along the river to revisit [...] an Indian hunting pit I’d located years before.“ (image below, link to Craig's Blog)

What is a Hunting Pit?

They were essentially early hunting blinds.

This document on Native Americans in Southwestern Montana describes a similarly-dimensioned pit and says, "The hunting pit [makes] it possible for a hunter to sit inside, undetected, with a view of the terrain [...]".

Here's a similar example in Colorado.