How A Border Wall Would Affect Wildlife Migration

Bidding closed this week for the Trump administration's plan to build a wall along the southern border with Mexico, with 200 companies applying for the project.

The promise to build a border wall originated during then-candidate Donald Trump's run for president. But Jeff Corwin says a wall wouldn't just hold back potential migrants, it would inhibit animal populations that pass through that region, and could have disastrous effects on a sensitive ecosystem.

Jeff Corwin, wildlife biologist and host of ABC's "Ocean Treks." He tweets @jeffcorwinlive.