Environmentalists worry about pollinating species in the pivotal desert borderland as more tall barriers are planned by the U.S. government to curb migration and trafficking.

By Tina Deines

It was a balmy day in Del Rio, a Texas border town about 170 miles west of San Antonio, when a citizen conservationist looking for wildlife stumbled upon a striking rust and orange caterpillar with fleshy horn-like protrusions that are meant to scare predators.

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