Sharks and other fish often school together in "Feeding Frenzies" that begin when seabirds dive and swirl to concentrate baitfish. Human fishermen search the waves for these gatherings too. They steer their boats to the diving birds and fish for their favorites that swirl with the sharks in the depths below.

Photo by John Hoover from Undersea Hide and Seek, a book in progress. See more of John's spectacular photos at www.hawaiisfishes.com.