Leviathan (Leviathan, #1)

Leviathan is a 2009 novel written by Scott Westerfeld and illustrated by Keith Thompson. It is the first work in the trilogy of the same name, followed by sequels Behemoth and Goliath. The trilogy is set in an alternative version of World War I in which the Central Powers (known in-universe as "Clankers") use mechanized war machines and the Triple Entente (referred in text as "Darwinists") fabricate living creatures genetically for use in battle. Leviathan was named the Best Young Adult Novel by the Aurealis Award in 2009, Locus in 2010, and Mir Fantastiki in 2011.