Hello, Chief!
Hurry up and look at the Special ⭐ tab of the Store. There are new items available. Collect Firesaurus' Eggs from adventures to build a 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.
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.
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