This Is my guess/hypothesis if you leave a wyvern egg sitting on its nest for a long time and you get it after so long you have a big chance of getting triplets. Trust me I did it my first wyvern egg and I got triplets. Up so people know if they dont know they wont do it and get triplets
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.
*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."
If you desperatly missing milk (and if you have no life) you can just give to your growing wyvern a enduro stew every 15 minute, this while prevent her for losing health when her food while reach 0, and while keep up the matuation process
Imprinted Snow Owls are amazing for stealing eggs. They get a 20% speed boost once imprinted. That along with the glide makes them faster than Wyverns.
If you get their stats high enough you can kill Wyverns with them as well even an alpha wyvern if you keep it chasing you with their wide turning radius avoiding most of the damage.
The freeze heal is nice after you have been hit with poison breathe quickly gain your health back. Just bring some food for your hunger.