Shark (IMAGE) Woods Hole Oceanographic Institution Caption A new study demonstrates that large predatory fishes like sharks, tunas and billfish make a surprising number of visits to the deep ocean—particularly the ocean’s twilight zone, which has been overlooked as critical habitat for large predator species. Credit Tiger Shark /©Tom Burns Usage Restrictions With proper credit and caption License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.