Beastologist: Flight of the Phoenix by R.L. LaFevers

Nate Fludd is a 10-year-old orphan whose parents perished in an airship accident in the Arctic. Sent to live with his adventurous Aunt Phil, Nate learns that he comes from a line of beastologists. His family has studied supposedly mythical creatues such as basilisks and gremlins for generations. Shortly after arriving he and Aunt Phil embark on a trip to Arabia to witness the birth of a new Phoenix. Featuring strong character development and high adventure this new series would be perfect for third and fourth graders who like fantasy mixed with danger. Book two is The Basilisk's Lair.