Rex Egg

What a Rex Egg is good for

The Rex Egg is laid by the Rex in ARK: Survival Evolved and ARK: Survival Ascended. The ARK Wiki says Rexes drop these eggs at random, and that an egg from two mated Rexes hatches into a baby Rex. Its description reads: "Tremendously nourishing by itself, this egg provides exceptional nutritional value in many cooking recipes." Survivors can eat it or turn it into Exceptional Kibble.

Exceptional Kibble and taming

The wiki lists that kibble as taming food for creatures such as the Giganotosaurus, Quetzal, Mosasaurus, Therizinosaur, Spino, Managarmr, Yi Ling and the Rex itself. Any creature that takes Basic, Simple, Regular or Superior Kibble accepts it too.

Hatching temperature and time

The egg needs between 32 and 34 °C (90 to 93 °F) and takes 4h 59m 58.561s to hatch; outside that range it loses health. An Egg Incubator set to the best temperature cuts the time by up to 20%. It takes a female Rex between 18h and 2d before she can lay again.

Taking an egg from wild Rexes

Wild Rexes nearby turn hostile when someone grabs an egg. The wiki suggests a fast getaway on a flyer such as a Quetzal, Argentavis or Pteranodon (as long as it can carry the egg), or on an aquatic mount near water, since Rexes swim poorly. The no-risk option is to tame female Rexes: they do not retaliate when you collect their eggs. A male Rex with Mate Boost speeds up laying, and an Oviraptor helps as well.

Weight, spoiling and maps

Each egg weighs 15 and stacks to 100, so a full stack weighs 1500. It spoils in 192 hours (8 days). Our records list it on 8 maps, including The Island, Scorched Earth, Extinction, Ragnarok and Astraeos. Fertilized Rex Egg and Fertilized X-Rex Egg are related variants.