Common Companions:
* Other whales: Blue whales often travel in loose groups, and might be seen alongside other baleen whales like humpback whales, fin whales, and gray whales.
* Seabirds: Birds like albatrosses, petrels, and shearwaters often follow whales, hoping for scraps of food or to snatch small fish disturbed by the whale's feeding.
* Smaller fish: Blue whales eat krill, tiny crustaceans that are also food for many smaller fish like herring, sardines, and anchovies.
Less Common, but Still Possible:
* Dolphins: Dolphins are often found in areas with abundant food, but they're smaller than blue whales and might be less likely to be seen together.
* Sharks: Some shark species might share areas with blue whales, but the whales are so large they are rarely a target for sharks.
* Sea turtles: Sea turtles are known to migrate through areas where blue whales are found, but their paths don't always overlap.
Important Note: Blue whales are massive animals, and most of their companions are much smaller. They might be found in the same general area, but it's less common to actually see them swimming together.