1. Birds don't pee. Trentgarverick / Getty Images They don't even have a urethra to do it — everything goes out the booty. 2. Eggplants contain nicotine. Nuttakit / Getty Images But you'd have to eat 20 pounds of them in order to get the nicotine effect of a cigarette. 3. Babies can't dream. Javi_indy / Getty Images Neuroscientists believe dreaming starts around age 4 or 5. 4. Stars eat planets. Titoonz / Getty Images If a planet's orbit comes too close to a star...game over. 5. Fergie voiced Sally. Noam Galai / Getty Images / Charles M. Schulz She's one of two dozen performers who have lent their voice to Charlie Brown's sister — her turn was in the '80s, long before she was famous for her music. 6. Turtles masturbate. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Mirage Studios So do walruses, porcupines, and elephants. And humans. 7. Jellyfish can evaporate. Ratikova / Getty Images They're 98% water, so getting washed up on the beach is bad news. 8. Gold is edible. Ktsimage / Getty Images But don't eat your gold jewelry — it's cut with lots of inedible metals. 9. Monkeys sometimes floss. Filipe_lopes / Getty Images They'll use anything from bird feathers to blades of grass to get the job done. 10. McDonald's does weddings. instagram.com According to Business Insider, a McDonald's wedding package will set you back anywhere from $373 to $1,290 — but they're only available in Hong Kong for now! 11. Saturn rains diamonds. 123dartist / Getty Images Scientists estimate about a thousand tons of diamonds rain down on Saturn every year — each up to a centimeter wide. Oh, and Jupiter rains diamonds, too! 12. Dolphins name themselves. Andrea Izzotti / Getty Images Dolphins have unique whistles — and their fellow dolphin friends will mimic that whistle to get their attention. Dolphin researchers believe this whistle is their version of having a name. 13. Swearing relaxes people. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF ABC It might seem counterintuitive, but studies indicate that yelling a good "Fuck!" can actually calm you down. 14. Mangoes get sunburns. Snapple It ruins a lot of crops! 15. Horses can't vomit. Vikarus / Getty Images Their bodies simply aren't built for it. Kinda lucky! 16. Avocados are berries. instagram.com While strawberries and raspberries are not. 17. Lighters predate matches. vitsirisukodom / josiephos / Getty The match might seem like more primitive technology, but it actually was invented three years after the lighter. 18. Sharks predate trees. lindsay_imagery / Olegkalina / Getty For about 50 million years, the world had sharks and no trees. 19. Wombats poop cubes. Twitter: @EmmaBowers Wombats mark their territory with poop, and these little cubes stay in place better than your typical cylindrical shits. 20. Blood contains gold. Ilexx / Getty Images But before you get too excited: Most bodies contain just 0.2 milligrams of it. So don't quit your day job! And finally... 21. Orcas are dolphins. Musat / Getty Images That's right — the so-called "killer whales" aren't even whales.