Sometimes when a player loots living chests they will find Mystery Eggs. These are essentially a type of a mystery box but for spawn eggs. When holding a Mystery egg and right clicking, a random passive spawn egg will drop.
Mystery eggs can also be crafted to a Hostile Mystery Egg, which function the same but will drop hostile eggs instead.
The main usage of these spawn eggs are in the mods Cagerium and Ispawners. In these mods spawn eggs can be used to obtain the spawn egg's mob drops. For example, having a pig egg with either of these mods will let you get infinite porkchops.
Mystery eggs can also be obtained from Bounties, Black Market, Flesh Chests and Resource Cards.
The drop chances and the available eggs are:
| Icon | Egg Name | Drop Chance | Mob Drops |
|---|---|---|---|
 |
Pig Spawn Egg | 16.89% | Raw Porkchops |
 |
Sheep Spawn Egg | 13.51% | Raw Mutton and Wool (color dependents on the sheep color) |
 |
Chicken Spawn Egg | 10.81% | Raw Chicken and Feathers |
 |
Cow Spawn Egg | 10.81% | Leather and Raw Beef |
 |
Cod Spawn Egg | 4.05% | Raw Cod and Bonemeal |
 |
Mooshroom Spawn Egg | 2.70% | Leather and Raw Beef |
 |
Rabbit Spawn Egg | 2.70% | Raw Rabbit, Rabbit Hide and Rabbit’s Foot |
 |
Salmon Spawn Egg | 2.70% | Raw Salmon and Bonemeal |
 |
Squid Spawn Egg | 2.70% | Ink Sac |
 |
Bee Spawn Egg | 2.02% | Nothing |
 |
Cat Spawn Egg | 1.68% | String |
 |
Goat Spawn Egg | 1.68% | Nothing |
 |
Tropical Fish Spawn Egg | 1.68% | Tropical Fish and Bonemeal |
 |
Dolphin Spawn Egg | 1.68% | Raw Cod |
 |
Polar Bear Spawn Egg | 1.36% | Raw Cod and Raw Salmon |
 |
Bat Spawn Egg | 1.36% | Nothing |
 |
Parrot Spawn Egg | 1.36% | Nothing |
 |
Pufferfish Spawn Egg | 1.36% | Pufferfish and Bonemeal |
 |
Donkey Spawn Egg | 1.36% | Leather |
 |
Axolotl Spawn Egg | 0.67% | Nothing |
 |
Glow Squid Spawn Egg | 0.67% | Glow Ink Sac |
 |
Panda Spawn Egg | 0.67% | Bamboo |
 |
Strider Spawn Egg | 0.67% | String |
 |
Turtle Spawn Egg | 0.67% | Seagrass |