Hello, Chief!
Hurry up and look at the Special ⭐ tab of the Store. There are 4 new items available. Collect Firesaurus' Eggs from adventures to build a Firesaurus nest.
Each nest lasts for 7 days and can be placed on any island except Fisherman's Cove. After 7 days you should recharge the nest using Roasts. If you don't have enough Roasts to recharge a nest, it will act as a decoration.
You can't have more than 4 nests in total across all islands.
To build Firesaurus nests and replenish them, you'll need special items called Firesaurus' Eggs and Roasts. These items are provided by merchants encountered during the adventure event.
Firesaurus' Egg -> 
Roasts -> 
Please note that you can't purchase Firesaurus' Eggs and Roasts using Gems. You also don't have to build all 4 nests during one event. The Merchants are going to be available during every event.
Merchants
The Alchemist
-> trades Firesaurus' Eggs for resources you collected during the adventure event
Chef
-> trades items from the adventure event for Roasts
The Pilot
- > exchanges Firesaurus' Eggs for Roasts
You already know these 4 pets from the Merge side-game:
Petrie
Petrie's Nest
Construction Cost: Firesaurus' Egg x 1
Rewards:
x 25
x 73
x 1
Recharge time: 6 hours
Recharge Cost: Roasts x 1
Rexie
Rexie's Nest
Construction Cost: Firesaurus' Egg x 2
Rewards:
x 70
x 115
x 1
x 1
Recharge time: 8 hours
Recharge Cost: Roasts x 2
Daisy
Daisy's Nest
Construction Cost: Firesaurus' Egg x 3
Rewards:
x 135
x 405
x 1
x 1
x 1
Recharge time: 12 hours
Recharge Cost: Roasts x 3
Trish
Trish's Nest
Construction Cost: Firesaurus' Egg x 4
Rewards:
x 278
x 1
x 1
x 1
x 1
x 1