There are 6 books in the Race the Wild series. The newest book is Mountain Mission which came out in 2016.

When Russell entered the race, he knew it was going to be a wild ride. Especially the first race course! He'd been studying up on the Amazon's animals and culture forever. But nothing could prepare him or his teammates for what they'd find in the rain forest: raging rapids, poisonous…
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2
Great Reef Games

Book cover of Great Reef Games
On a once-in-a-lifetime race through the animal kingdom, it takes smarts, strength, and skill to win!

Sage is used to being the fastest runner, the quickest climber, and the strongest swimmer around. And she's also used to taking charge. But when the second race course has the red team diving…

3
Arctic Freeze

Book cover of Arctic Freeze
The air might be freezing, but the race is heating up! Dev can't stop thinking about how much he'd disappointed his dad by signing up for The Wild Life.  But to win a race through the frozen Arctic tundra, where animals are ferocious and nature is extreme, the red team…

4
Savanna Showdown

Book cover of Savanna Showdown
On a once-in-a-lifetime race through the animal kingdom, it takes smarts, strength, and skill to win!

This amazing race is getting wild!When the teams take on the African savanna, the competition heats up, and Mari starts to feel the pressure. She's never been the strongest or the fastest racer. Sure,…

5
Outback All-Stars

Outback All-Stars
FOR USE IN SCHOOLS AND LIBRARIES ONLY. G'day mate! It's an all-star race through the Australian Outback. But each team is a champion. So Sage knows the red team is going to have to be smarter and tougher than the competition if they want to win. If not, they'll be…

6
Mountain Mission

Book cover of Mountain Mission
On a once-in-a-lifetime race through the animal kingdom, it takes smarts, strength, and skill to win!

The team is climbing to new heights!The last leg of the race lands teams in the Himalayas, one of the most treacherous mountain ranges in the world. But when a rockslide disaster threatens an…