Short Answer: Because they don't want to quack up mid-flight! 🦆😄
Explanation: Ducks are known for their quacking sound, which is their way of communicating. Since telling jokes would require them to make different sounds, they avoid it while flying to avoid any potential mishaps. After all, it wouldn't be very graceful for a duck to burst into laughter mid-flight! So, they save their jokes for when they're safely on the ground. 🤭🌬️
