The Extincts. 1 Quest for the Unicorn Horn

In The Extincts: Quest for the Unicorn Horn, a team of genetically enhanced extinct animals embark on top-secret missions around the world-first in New York Times bestselling illustrator Scott Magoon's graphic novel series.
 
Meet Scratch, Martie, Lug, and Quito, members of a secret organization called R.O.A.R., or the Rescue Ops Acquisition Rangers. When their boss, Dr. Z, finally calls on them for their first big mission, the team heads to Siberia to retrieve an ancient unicorn horn from the thawing permafrost. Scratch is thrilled at the chance to prove his worth to Dr. Z-but as soon as they land, the team runs into a mysterious enemy determined to take them down.
 
With exciting missions, plenty of humor, and an environmental angle, this series starter is an action-packed adventure from start to finish. The book also includes nonfiction back matter about extinct animals, climate change, and what kids can do to help!

The Extincts series:
The Extincts: Quest for the Unicorn Horn (#1)
The Extincts: Flight of the Mammoth (#2)