Rex Egg

The Rex Egg is one of the Eggs in ARK: Survival Evolved.

Collecting
A flying mount, such as quetzal, or argentavis, and a quick ascent after retrieving a Rex Egg is a good idea, as even one Rex can prove to be a challenge on foot, let alone any others also offended by stealing the egg as well. If the egg is near a sufficient body of water, an aquatic mount can also provide an effective means of escape, as Rexes are poor swimmers. A well-planned assault or distraction with other players and/or mounts can also make egg retrieval easier, though the risk of losing tamed animals to a Rex is a questionable sacrifice for an egg. A Pteranodon is also an ideal mount to escape with, just make sure it can carry it.

Alternatively, you can tame some female Rexes to easily obtain eggs with no risk, as they will not retaliate if you pick up the eggs A Male Rex can speed up the egg laying process with Mate Boost, and an Oviraptor will also help

Super Fertilized Egg (Mobile)
Oeuf de T-Rex