Stego Egg

An egg from the Stegosaurus

Stego Eggs come from the Stegosaurus in ARK: Survival Evolved and ARK: Survival Ascended; the ARK Wiki says Stegos drop them at random. The in-game text: "Tremendously nourishing by itself, this egg provides regular nutritional value in many cooking recipes." Take care when picking one up: wild Stegos nearby turn hostile and attack.

Regular Kibble from Stego Eggs

Besides being edible, the egg goes into Regular Kibble, according to the wiki. That kibble is the specific taming food for creatures such as the Velonasaur, Terror Bird, Sabertooth, Pteranodon, Ankylosaurus, Thorny Dragon and Carbonemys, and any creature that eats Basic Kibble or Simple Kibble takes it as well.

Hatching Stegos

When two Stegos mate, the egg that results can hatch into a baby Stego, and the wiki lists the Fertilized Stego Egg and the Fertilized Aberrant Stego Egg as variants. Incubation, per the wiki, lasts 2h 46m 39.2s and needs a temperature between 22 and 28 °C; outside that range the egg starts losing health. In an Egg Incubator set to the ideal temperature, the incubation time drops by up to 20%. A female needs 18h to 2d before she can lay again.

Weight and spoilage

Each egg weighs 12 and they stack to 100, so a full stack weighs 1200. Eggs spoil after 691200 seconds, which works out to 192 hours or 8 days. Our records list 8 maps for it, among them The Island, Aberration, Extinction and Astraeos.