Snake skin (left) and animal footprints are seen on Zavaleta’s ranch. Wildlife conservationists are wondering how much of an obstruction the barrier will be to animals that range along the river.

Published January 14, 2020 at 2560 × 846 in Border Wall Threatens National Wildlife Refuge That’s Been 40 Years In The Making

Snake skin (left) and animal footprints are seen on Zavaleta’s ranch. Wildlife conservationists are wondering how much of an obstruction the barrier will be to animals that range along the river.