How do you raise Wyverns in Ark?
When raising a Wyvern it will require to be fed Wyvern Milk throughout the stages before it is fully grown. One Wyvern Milk will provide 1200 food for a Wyvern with any food.
If you use the deadon's healing ability you can raise wyvern without any milk!
Incubation Time
The egg requires 80 - 90 Degrees Celcius / 176 - 194 Degrees Fahrenheit, taking 4d 1h 35m 31s for the egg to hatch and reach full maturity (Stats for Lvl 190 Egg) after being placed in a room with a minimum of 20 Campfires recommended.
You don't need milk to raise a baby, the milk is for imprinting only. Hope this helps, happy hatching! Wyvern Tips | Dododex.
Snow Owl. Tips & Strategies
It can heal all Allies, itself and yourself with its main ability. You can raise Wyverns by just healing them every 15-20 minutes (no need for milk!
The babies can be fed raw meat like any other carnivore. Stat imprinting requires Wyvern Milk (Scorched Earth).
Gathering. After knocking out a female Wyvern, 5 Wyvern Milk can be found in its inventory. Wyvern torpor depletes quickly, so you should loot it as soon as possible because once the Wyvern wakes up with the Milk still inside, it will be gone until the refresh period when it is knocked out again.
How do I feed a hatched baby Wyvern? Regular wyverns babies eat wyvern milk (tranq female or kill alpha wyvern to obtain); crystal flavored ones eat primal crystal (tranq crystal wyverns or kill alpha crystal wyvern).
You only need to feed them once the food bar drains, which is once every few hours. They can hatch and wonder around for hours before starving. Female Wyverns need to be knocked out to get 5 milk from their inventory.
Wyverns lose 1 good point per 10 seconds, and 360 points per hour. So 1 wyvern milk will sustain a wyvern for 3.33 hours due to it's 1200 food points. If it's a low level, it might not have 1200 points and have to be force fed milk to avoid starvation.
What do fully grown wyverns eat?
As far as I know, wyverns only eat wyvern milk which you get by knocking out other wyverns. You can not tame adult wyverns. You can only hatch eggs that you steal from them.
When raising a Wyvern make sure it's food does not plummet to low. Lower level babies may not have 1200 food so you may need to force feed the milk rather then having it feed itself. Imprinting with milk also counts as a feeding, so don't feed him milk before an imprint!

When the egg hatches, you will have to take care of the wyvern until it grows. You have to do the things that the wyvern asks you to do. The hardest one is to give it wyvern milk. To acquire this you need to knock out an adult wyvern or kill an Alfa.
It takes around 3 days and 20 hours to grow to an adult and they will take Wyvern Milk for imprinting and petting but can be rare prompt.
More Crystal Wyvern Taming & KO Tips. Only eat primal crystal while raising. And not notmal crystal or Raw meat or else.
As far as I know, wyverns only eat wyvern milk which you get by knocking out other wyverns. You can not tame adult wyverns. You can only hatch eggs that you steal from them.
Regular wyverns babies eat wyvern milk (tranq female or kill alpha wyvern to obtain); crystal flavored ones eat primal crystal (tranq crystal wyverns or kill alpha crystal wyvern).
Notes. Tamed female Wyverns do not have milk in their inventory. Wyvern that have been spawned in and forcetamed will have milk in their inventory. This is true even on Official servers such as when a GM or Dev spawns one in.
Wyverns only eat Wyvern milk until they are adults. Their food value is high for a hatchling, and drains very slowly. You only need to feed them once the food bar drains, which is once every few hours.