Many sharks like the company of family and friends, with researchers only just beginning to understand the complex social lives of these ocean predators.
Shark schools, hierarchies, alliances and other shark-to-shark connections offer benefits, helping to explain why many toothy marine dwellers not only put up with each other, but also often seem to enjoy doing so.
These whitetip reef sharks were photographed hanging out together in Guam. Shark expert Greg Stone, chief scientist at Conservation International, told Discovery News, "These sharks live on busy reefs where there are a lot of fish. They hunt in groups at night and also rest in caves with other whitetips during the day. They have also been observed hunting along with other species of sharks on the reef."