Primal Egg

After three days, this egg will hatch into a Cracked Primal Egg, which may contain a primal raptor mount!

Source
This item drops from all dinosaurs on the Isle of Giants: devilsaurs, direhorns, and skyscreamers. The egg does NOT drop from the humanoid Zandalari Dinomancers.

It can also appear in the Treasures of the Thunder King, Spoils of the Thunder King, Stormtouched Cache and Shiny Pile of Refuse consolation loot bags.

Loot

 * See Cracked Primal Egg for what you may find after the egg has hatched.