We’ve all seen a movie where someone uses a bird to deliver a message. It’s a trope of fantasy films and novels, but is it possible? While sending a message by raven might not be, it turns out science can confirm that pigeons actually can deliver mail for you. How are they able to achieve this feat? You’ll have to watch this video to find out how. Just remember, don’t make your envelope too heavy. Now get out there and train yourself a bird.