Presents information on flying reptiles and birds that ruled the prehistoric skies and, when turned over, information about the creatures found in prehistoric seas.

No collective title page; titles transcribed from individual title pages; works bound back-to-back with inverted pagination. First work previously published: In the sea. Milwaukee : Gareth Stevens Pub., 2001. 2nd work previously published: In the sky. Milwaukee : Gareth Stevens Pub., 2001.