Primal Egg

The Primal Egg arrived in update 1.14.0 as the prehistoric companion to the Dinosaur lineup, and its defining trait is the hatch timer: a full 4 hours and 10 minutes, identical to both the Zen Egg and the Dinosaur Egg. That slow cook is the first thing to weigh, because in Grow a Garden an egg that ties up an incubator slot for over four hours needs a pet pool strong enough to justify the wait.

What you are really gambling on here is a prehistoric-themed roster, and the headline chase is the Mythical-tier dinosaur pets that share this era of content, the same family the Pterodactyl belongs to. Because the row carries no listed cost or stocked shop, this is best understood as a limited or event-gated egg rather than a permanent Sheckle purchase, so availability matters as much as luck.

Practically, only commit the Primal Egg to an incubator overnight or while you are AFK farming, never during an active grind where a faster egg would cycle two or three times. Chase it for the rare dino pets; if you only want filler, the long timer makes cheaper eggs the smarter play.