We are conducting an international collaborative study to investigate the environmental responses of large fish, marine mammals, seabirds, and sea turtles using the "biologging" technique, in which measurement devices are attached to wild animals. Focusing on five representative marine environmental stressors (ocean warming, declining sea-ice, declining oxygen, pollution, and underwater noise), we aim to clarify the effects of individual stressors and the interaction of multiple stressors on marine animals and ecosystems.