Screwworm: America Defeated This Wildlife Nightmare Once. Now It’s Back

Few wildlife threats are as horrifying—or as potentially devastating—as the New World screwworm.

Today on Dark Outdoors, we're taking a deep dive into a parasite that eats living flesh—and it's no longer a problem confined to the history books. The New World screwworm is in Texas, it is spreading, and wildlife professionals, ranchers, hunters, and animal health experts are sounding the alarm.

Joining me is legendary wildlife biologist Larry Wyzun, known throughout the hunting and conservation world as "Mr. Whitetail." Larry is one of America's most respected deer experts and one of the foremost authorities on whitetail deer biology in the world.

What makes Larry's perspective especially important is that he witnessed the original screwworm crisis firsthand. Early in his career, he saw the devastating effects this flesh-eating parasite had on wildlife and livestock before America achieved one of the greatest animal health victories in history by eradicating it from the United States.

Now, decades later, screwworm has returned as a growing threat. As it spreads, concerns are mounting about the impact on whitetail deer, endangered species, livestock, pets, and rural communities. The consequences could reach far beyond individual animals, affecting wildlife management, conservation efforts, agriculture, and hunting traditions across America.

Many experts view the New World screwworm as the most significant wildlife health threat our nation has faced in the last half-century. Unlike many diseases that weaken animals over time, screwworm larvae consume living tissue, creating horrific wounds that can ultimately lead to death if left untreated.

In this episode, "Mr. Whitetail" Larry Weishuhn, a globally renown wildlife biologist shares firsthand memories from the battle against screwworm decades ago, explains why this parasite is so dangerous, and offers his expert insight into what its spread means for the future of America's wildlife.

This is Dark Outdoors. I'm Chester Moore, and today we're examining what may be the greatest threat to American wildlife in 50 years—the return of the New World screwworm.