Fences, walls, and border barriers across wildlife migration routes cause animal deaths, habitat fragmentation, and population isolation with growing welfare and conservation impacts.
Barriers to wildlife movement cause animals to die attempting crossings, face starvation from severed migratory routes, and suffer population isolation and inbreeding. Vehicle collisions at fences kill and injure animals that cannot cross and pace near high-traffic corridors. The welfare impacts are individual and chronic — animals encounter barriers repeatedly throughout their lives.