When walking your baby wyvern don't think to yourself I'll just take it for a little swim through this lake. Because as soon as it hits the water it starts to fly and it won't stop! When you whistle to stop it just starts to fly off into the sunset. Say good buy to your wyvern and all the milk in its inventory.
*Finding out you can tame dragons*
"YEEEEESSSSSSS DRAGONS YEEEEEAAAAASSSSSSS"
Wiki: "You must go into its nest with a fast bird, steal an egg, run away from 50+ wyverns trying to kill you, go back, get a female wyvern, knock it out, get its milk to feed your baby wyvern, raise your baby wyvern for many real life days, never sleep, starve, make sure you got lots of milk, get arthritis, play non-stop, never see society again, boom you have yourself a wyvern."