It was disturbing for me to learn that dyer lint can actually kill birds. I knew it didn't make good nesting material because it turns rock hard after it gets wet. But apparently, human hair can make its way into the lint and be blown outside. A friend of mine reported finding a female house finch near the dryer vent on the outside of her garage yesterday. Its feet were covered in lint and bound by a single human hair. Its beak was also full of lint. She believes it may have struggled in the heat to free itself until it died. There were no other visual signs of illness or injury. Hopefully, this was a rare case, but it's a good idea to clean out your dryer vents anyway. It helps increase the air flow and prevents dryer fires.