T-Rex and Frost Fury

The T-Rex is a limited legendary pet, which was released in Adopt Me! on October 10, 2020. Its release was confirmed in the Fossil Isle Excavation Event, which started on October 2, 2020. As it is now unavailable, it can only be obtained by trading or hatching any remaining Fossil Eggs. Players have a 5% chance of hatching a legendary pet from the Fossil Egg, but only a 2.5% chance of hatching a T-Rex The T-Rex appears on the T-rex Throw Toy and the T-rex Rattle. Both of these toys could be found when excavating for fossils in the Fossil Isle .There is a re-skin of this pet called the Skele-Rex, which is a Halloween-themed version, that was obtainable during the Halloween Event (2020).The Fossil Egg resembles the T-Rex.

The Frost Fury is a limited legendary pet that was introduced during the Winter Holiday Event (2020). It was only available for purchase for  800. As the event has ended, it is now currently only obtainable through trading .It was the only pet in the Winter Holiday Event 2020 update that can be bought with Robux .It was the seventh dragon pet in the game, after the Dragon, Bat Dragon, Shadow Dragon, Frost Dragon, Golden Dragon, and Diamond Dragon, and the only dragon pet without wings. The Arctic Reindeer, Ghost Bunny, Shark, Octopus, Stingray, Dolphin, Narwhal, Clownfish, Frost Fury and the Reindeer are the only non-bird pets that do not have wings after being fed a Fly-A-Pet-Potion. They still fly normally, just without wings and almost as if they were floating through the air, or alternatively, riding in the air. When fed a Fly-A-Pet-Potion, Frost Furies do not grow wings, instead, they float up and down. The Frost Fury will also change in size to compensate for your avatar if you are playing as a Parent. The size of the Frost Fury will not change when ridden (unless fed a Big Brew Potion or a Small Sip Potion) when the player is playing as a Baby.The Frost Fury was the third most expensive  Robux pet in the game, the most expensive being the Shadow Dragon and Frost Dragon.