There's a phrase wildlife managers use. You've may have heard it:
"A fed bear is a dead bear."
It sounds like a bumper sticker slogan, but it’s a precise description of what happens when bears find our food scraps.
How food conditioning works
When a wild animal finds human food, even once, something shifts. The animal's brain records the location, the smell, the context. It files "human trail" or "campsite" under food source and starts returning. Each successful visit reinforces the behavior.
This process has a clinical name: food conditioning. And it is, in most cases, a death sentence for wildlife, especially bears.
Once a bear becomes food-conditioned, discouraging it doesn't work. Relocation doesn't fix it either: food-conditioned bears either return to the original territory or find new people to approach.
Glacier National Park's guidelines are unambiguous about this: "Food-conditioned bears are not relocated due to human safety concerns." They are euthanized.
The 4-year-old female black bear euthanized in West Glacier in June 2025 was healthy. Field necropsy confirmed that she was in perfect physical condition. She was killed because someone, somewhere, let her get a food reward. She learned exactly what she was taught, and it cost her her life.
It's not just bears
The mechanism is identical across species.
Coyotes that shift toward human food sources become bolder and more likely to end up trapped or euthanized. The food-conditioned ones are the ones generating conflict reports, while the ones eating rodents in the park are invisible, because they're doing exactly what they're supposed to.
Supplemental feeding of deer feels harmless, but it isn't. Corn causes rumen acidosis because deer evolved to digest woody vegetation, not carbohydrates. Feeding stations also concentrate disease transmission, including chronic wasting disease, which is spreading across the country and has no cure.
The banana peel problem
Most people who contribute to food conditioning aren't doing it intentionally. They toss an apple core off the trail because it's "natural." They leave orange peels because they'll "decompose."
An apple core on a trail is not natural food. It's a human scent marker attached to a calorie source, sitting exactly where humans walk. A bear that finds it learns that the places that smell like humans also have food.
Orange peels take up to two years to decompose in cold mountain environments. Banana peels, six weeks to two years. In the meantime they sit there training animals that human presence means food.
The National Park Service is clear: food conditioning happens whether visitors offer scraps intentionally or simply forget to secure their trash. Intent is irrelevant. The animal only knows what it learned.
The takeaway: pack it out. Every time.
Most people who've ever tossed a peel on a trail didn't know any of this, but now you do.
And that's actually the whole game. Wildlife managers can't be everywhere and rangers can't watch every trail. The only thing that reliably protects bears from this fate is hikers who understand what's at stake and make a different choice.
You are the enforcement mechanism, not because someone is watching, but because you know what the banana peel actually costs.
A fed bear is a dead bear, but you can change that.