How to Obtain and Hatch Dinosaur Eggs in Not Enough Dinosaurs
Dinosaur eggs in Not Enough Dinosaurs are not found lying in the dirt — they are manufactured. To get an egg, you first need an embryo, and turning that embryo into a viable egg requires heat. The full process runs from crafting an 
Embryonic Machine, through producing embryos, to smelting each embryo into its matching egg.
Crafting the Embryonic Machine
Everything starts with the Embryonic Machine, since embryos are what you smelt into eggs. It is made with a shaped crafting recipe using the following ingredients:
Iron Ingot x4
Bucket
Gray Dye
Computer And Processors
Stone Button
Redstone Dust
Arrange these in the correct shaped pattern in a crafting grid to produce the machine. Once you have it, you have the piece of equipment the egg process depends on.
Turning Embryos into Eggs
The conversion step is smelting. Each embryo type smelts into the egg of the same dinosaur, so the embryo you put in determines the egg you get out. The known conversions are:
Dilophosaurus Embryo smelts into a 
Dilophosaurus Egg
Dimetrodon Embryo smelts into a 
Dimetrodon Egg
Oviraptor Embryo smelts into an 
Oviraptor Egg
Because these are smelting recipes, you need a furnace and a fuel source to run them. Place the embryo in the input slot, add fuel, and wait for the smelt to finish. The output is the corresponding egg, ready to be used.
Planning Your Egg Production
The chain has two distinct stages, and it helps to keep them separate in your head. Stage one is embryo production, which is what the Embryonic Machine exists for. Stage two is smelting, which converts each embryo into its egg. If you want multiple dinosaur species, you will need to run the machine for each embryo type and then smelt each one separately, since there is no single recipe that covers all three.
It also pays to stock up on fuel before you begin. Smelting three different embryos means three separate furnace operations, and each one consumes fuel. Running out midway leaves you with embryos and no eggs.
What the Facts Cover
The information here is limited to the recipes above. The Embryonic Machine is crafted from Iron Ingot x4, a Bucket, Gray Dye, Computer And Processors, a Stone Button, and Redstone Dust, and it is the machine associated with embryos. The three egg types — Dilophosaurus Egg, Dimetrodon Egg, and Oviraptor Egg — each come from smelting their matching embryo.
Anything beyond that, such as how embryos are produced inside the machine, what happens after an egg is obtained, or any further steps involving the eggs, is not covered by these facts. Stick to what is described: craft the machine, obtain embryos, and smelt each embryo into its egg.
Quick Reference
- Embryonic Machine: Iron Ingot x4 + Bucket + Gray Dye + Computer And Processors + Stone Button + Redstone Dust, shaped recipe
- Dilophosaurus Egg: smelt a Dilophosaurus Embryo
- Dimetrodon Egg: smelt a Dimetrodon Embryo
- Oviraptor Egg: smelt an Oviraptor Embryo
Follow those steps in order and you will have your eggs. The key takeaway is that eggs are a smelting product, not a found item, so the Embryonic Machine and a fueled furnace are both essential to the process.
Covers the mod’s in-game guide topics: Dilophosaurus Egg Dimetrodon Egg Oviraptor Egg Embryonic Machine