River Monster
River Thumb

Normal: Baby - Teen - Adult - Egg
Mythic: Baby - Teen - Adult - Egg

Unlocked Level 14
Sells For 2,800 Icon coin
Breed/Hatch Time 28 Hours
Quick Finish Cost 28 Diamond
XP Gained 8,075 XP Logo


One of the more curious creature combinations, its strange anatomy at first confounded explorers. Worthington thought it an earth creature, noting its stone body, but Alexander classified it a water monster, pointing out the tail and flippers. It turned out both were right: this monster is entirely happy in either environment.

Purchase Cost Habitat(s)
180 / 225 / 1,125
Element Earth Element Water

Game Generated Names
This is a list of the randomly generated names that the game give all new monster. You can change the name if desired. Please see this page for more information.
Atlas Beaches Boots Bubbles
Buster Clay Core Crunchy
Crusty Dewy Fin Foggy
Gritty Hammer Hunk Lake
Pebbles Rattler Rocky Sandy
Slither Spring Surf Tidal
Torpedo Wavy

Breeding Information
Building 5x5 breedingcave tn@2x
The River Monster can be purchased for Diamond or bred by using Earth and Water elements in the Breeding Den. Hybrids may be needed for successful breeding. Also see the comment section below for some suggested combos.
Mythic Information
Although hatching a mythic version of the River Monster is random, your best chance to get one is to breed 2 River Monster's together. You must have the Mythic Cave on your island in order to get a mythic. You can also use boost to better your chances.

Monster Evolution
Building 4x4 evolutionlab tn@2x
There are 2 stages in which River Monster will evolve. Before you can reach Level 5, you must evolve your monster from a baby to a teen. The second stage is before reaching level 8 and evolves your monster from a teen to an adult. To evolve your monster you need to place it in the Dream Room. Below is how long it takes the River Monster to evolve from each stage and the quick finish cost.
Evolve Time Quick Finish Cost
Baby to Teen 15 Hours 15 Diamond
Teen to Adult 39 Hours 39 Diamond

Food Costs per Level
Baby Teen Adult
1 2 3 4 5 6 7 8 9 10
Food per Feeding 170 345 515 685 855 1,025 1,195 1,365 1,535 MAX
Total per Level 680 1,380 2,060 2,740 3,420 4,100 4,780 5,460 6,140 MAX
Totals 6,860 Icon food 12,300 Icon food 11,600 Icon food
Icon food Needed for Max. Level 30,760 Icon food

Earning Rates
Baby Teen Adult
1 2 3 4 5 6 7 8 9 10
Normal 6 7 8 9 10 13 17 24 32 44
Mythic 6 7 8 9 10 13 17 25 33 46


  • The River Monster is an original monster from the initial release.