Pigeons are often seen as dirty birds and an urban nuisance, but they are just the latest in a long line of animals that have been found to have abilities to help humans.

鸽子经常被视为肮脏的鸟类和城市的累赘，但如今，它们却成为了被发现有能力帮助人类的一长串动物中最新的一种。