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.
Hatching: you need a very hot area. Use standing torches in a circle (10 to 15). Or build a room with a lot of air conditioners.
Imprinting and baby survival: Make sure you have wyvern milk. They only consume that for food when babies. You have to manually feed it to them until they are juvenile. It is also the only food they will ask for during care. Also set the follow behavior to lowest and disable wandering in case they wanna walk.
Wyvern milk can be obtained from knocking out a female wyvern and looting her. You get 5 milk. Doesn't respawn on same female.
Alpha Wyverns can be killed and looted for 50 milk.
Milk can be stored in preserve bins but not fridges.
Wyverns have 3 attacks. 3rd attack changes from flight to ground. Primary=bite, secondary=breath, tertiary(flight)=pick up creature, tertiary(land)=wing flap that pushes back enemies and knocks down trees(collects thatch more than wood)
No saddle needed. Friends can stand on back. Dismount doesn't throw you.