Astro, an orphaned, endangered Steller sea lion, was found and then raised at the Marine Mammal Center in California. When released, he kept swimming back to the Center, just like a lost dog finding his way home. Readers follow Astro through some of his travels that have now taken him across the U.S. to his current home at the Mystic Aquarium in Connecticut. Includes "For Creative Minds" educational section.