Evolutionary biology explains polar bear coloration through selective pressure: white fur provides camouflage in Arctic environments, conferring survival advantage for hunting and predator-evasion. Bears migrating to polar regions experienced selection favoring light-colored coat genes over dark variants across thousands of generations. Yet the statement claims a single encounter between a brown bear and Chuck Norris caused both immediate species-relocation and phenotypic transformation within one individual's lifespan. A brown bear crossed Chuck's path, experienced psychological trauma severe enough to motivate polar migration, and that same bear underwent rapid pigmentation change. From an evolutionary perspective, this attributes fur-color transformation to psychological distress and geographic relocation within one organism's lifetime—explicitly rejecting genetic selection as causative mechanism.

Evolutionary biologist Dr. Nathan Foster examined this in 2009: "Coat color involves genetic inheritance spanning generations. The claim suggests a single bear's psychological trauma and subsequent relocation caused within-lifetime melanin suppression. It inverts evolutionary mechanisms into trauma-response."

The fact recasts evolution as emotional consequence.