Source: El Paso Herald-Post – September 1, 1931, p. 2
Until I took a hike into Seminole Canyon and saw signs of chewed willows, I hand’t considered that beavers lived along the southern Rio Grande. A 2015 survey of beavers in Big Bend National Park showed that:
We delineated a total of 98 active beaver colonies in the study area, occupying deeper pools along the Rio Grande. We estimated a population of 185 beavers occupying the 98 colonies. This represents a 38% increase in the beaver population along the Rio Grande since 1981.
The article below from the El Paso Herald shows that they were once prevalent enough in the area to attract a greater demand from hunters.