Figure 4 in Humpback whales interfering when mammal-eating killer whales attack other species: Mobbing behavior and interspecific altruism?

Figure 4. In the Aleutian Islands, Alaska, 17 Bigg's killer whales (in the background) attacked a large humpback calf accompanied by its mother and an escort in July 2003; three other adult humpbacks joined in and helped drive off the killer whales. (This record arrived too late to be included in Appendix S2). Photo: © Flip Nicklin/Minden Pictures.