These barriers cut through sensitive ecosystems, destroy thousands of acres of habitat, impede the cross-border migration of dozens of animal species, cause catastrophic flooding, and separate ...

There are animals trying to cross as if their life depended on it,” researcher Erick Meza told the Society of Environmental Journalists’ conference.

Rugged mountain ranges in southeastern Arizona halted the march of a steel border wall during the first Trump presidency. Wildlife advocates say it shows the importance of animal travel routes.