Silverwing by Kenneth Oppel

The story follows a young bat named Shade who embarks on a perilous journey after being separated from his colony during their migration. Determined to reunite with his family, Shade encounters various challenges and adversaries, including predatory owls and mysterious bats. Along the way, he discovers secrets about his species and the ancient conflict between bats and birds. Through courage and determination, Shade learns about friendship, survival, and his own identity, ultimately playing a crucial role in bridging the divide between the two species.