The Fossil Egg is a limited legendary egg in Adopt Me! that could be purchased for 
750. It was released on October 10, 2020, replacing the Aussie Egg. It was replaced by the Ocean Egg on April 16, 2021, and can now only be obtained through trading.
Appearance
The Fossil Egg is a green, brown, and tan-colored egg. The egg has a green tail with a yellow bottom. There are little dirt smudges around the egg as well as brown scales on its back. The Fossil Egg represents many features of the T-Rex; these features are shown in the egg's spikes, tail, and color.
Obtainable Pets
| Pet | Image | Rarity |
|---|---|---|
| Tasmanian Tiger |  |
Common |
| Ground Sloth |  | |
| Triceratops |  |
Uncommon |
| Stegosaurus |  | |
| Glyptodon |  | |
| Woolly Mammoth |  |
Rare |
| Dilophosaurus |  | |
| Pterodactyl |  | |
| Sabertooth |  |
Ultra-Rare |
| Deinonychus |  | |
| Dodo |  |
Legendary |
| T-Rex |  |
Trivia
- The Fossil Isle Excavation (2020) event was released a week prior to the Fossil Egg's release, teasing the pets that would be available in the egg.
- On October 10, the day that the Fossil Egg was released, 1.7 million players were on Adopt Me!, breaking the previous record for the largest amount of concurrent online players, which was also held by Adopt Me!.
Gallery
A Fossil Egg in-game.
The Fossil Egg countdown thumbnail.
Adopt Me!'s thumbnail during the Fossil Egg update.
The Fossil Eggs in the Gumball Machine.