After a woman died, a multimillion dollar painting she owned was re-assessed at $0 due to it containing part of a bald eagle. In America, it is illegal to buy or sell them without a permit. The IRS disagreed and put a $65M tax on it. But her heirs cannot sell the painting due to the eagle.
When a bald eagle loses a feather, it will automatically shed the same feather on it’s other side to maintain balance.