PCB Bioaccumulation and Polar Bear Penises

National Geographic News “Is Pollution Weakening Polar Bears’ Ability to Mate?”

This sounds like fodder for a late-night television laugh line, but this is a pretty scary example of how bioaccumulation of toxins can have important conservation consequences. From a conservation perspective, there is nothing worse than a ubiquitous pollutant reducing the ability of a threatened species to reproduce.