Harry Potter | Owls | Wizarding World https://www.harrypotter.com/writing-by-jk-rowling/owls
The old British superstition that it is unlucky to see owls flying by daylight is readily explained, for when wizards break cover to send messages by day, something dramatic must be afoot in the ma…
envelope on the off-chance that the owl is intercepted and the letter falls into other hands