Wyvern Milk

The only food a young Wyvern takes

Wyvern Milk is how baby Wyverns are raised. Its in-game line is "Eat it to gain nourishment, or feed to raise Wyverns!" Until it is fully grown a Wyvern eats nothing else, and meat of any kind is refused at every younger stage. Each unit gives a baby Wyvern 1200 food, and the milk is also what you use for imprinting. The item comes from Scorched Earth and, per the ARK Wiki, is also on Ragnarok, Valguero, Genesis: Part 1, Lost Island and Fjordur.

Collecting it

• Wild female Wyvern: knock one out and take the 5 Wyvern Milk from its inventory. Be quick, because Wyvern torpor drains fast and the milk is gone if it wakes up. The same female refills after about an hour.
• Alpha Fire Wyvern: a dead Alpha of either sex carries 50, although they spoil at the normal rate once taken.
• Loot: 46 crate types can contain it, including the Alpha Fire Wyvern and several Genesis crates on Genesis Part 2.

Tamed females never have milk. Keeping a wild female penned does not work either: a conscious wild Wyvern returns to its trench once you are out of render distance.

Drinking it yourself

Survivors can drink it too. It grants the Insulating Warmth buff for 180 seconds, which brings 787 hypothermal insulation and protection from catching diseases. While the buff lasts, the lingering burn that Wyvern breath leaves through the Enflamed debuff stops hurting you, and so does the Bleed that the Allosaurus, Giganotosaurus and Carnotaurus inflict.

Its protection has clear limits. Lava burns still apply, the breath itself still deals its hit, and the percentage-based breath of the Dragon, the breath of the Ember Crystal Wyvern and the burn of the Magmasaur all get through. The ARK Wiki also warns that the fire protection may not always work.

Keeping it fresh

The milk spoils in 30 minutes and does not fit in a Refrigerator. In the inventory of a Fenrir the timer rises to 2 days and 2 hours, and it doubles with Preserving Salt.