What Do Whales Eat?

Baleen whales are the world's largest filter feeders, diving deep to scoop up massive amounts of seawater then straining it through baleen plates to capture krill and small fish species. The blue whale consumes up to 5,000 pounds of krill in a single day during feeding season. Fin whales and humpback whales also eat krill along with small schooling fish like herring and capelin. Toothed whales including sperm whales and orcas hunt larger prey such as fish and squid in deeper waters. Orcas are ocean apex predators and hunt seals, sea lions, and even other whale species. Gray whales eat bottom-dwelling organisms and small fish stirred up from the seafloor. Each whale species has specialized anatomy and hunting behavior perfectly suited to capturing its particular food sources in its ocean home. Learn more about whales at wildlife.

Whale feeding patterns change dramatically with the seasons as prey availability fluctuates. In polar regions, whales feed intensely during summer months when krill and small fish populations peak dramatically. Humpback whales and many baleen whales travel thousands of miles from their winter breeding grounds to reach rich feeding grounds in polar waters. Gray whales make these long migrations twice each year following seasonal food abundance patterns. During winter, whales often eat less frequently as they focus energy on breeding and caring for calves instead of hunting. Many species store energy as thick blubber during feeding season to survive leaner months. Orcas that hunt large prey like seals have more consistent food availability throughout the year. Their feeding patterns change less with seasons than filter-feeding whales do. Food availability determines migration timing and breeding cycles for all whale species.

Sea turtle diet varies dramatically based on ocean region and available prey species around them. Whales in the North Atlantic hunt different species of fish and krill than whales in the Pacific Ocean or Antarctic waters. Humpback whales feeding off Alaska eat capelin, herring, and small schooling fish, while the same species in Hawaii during winter breeding season may not eat at all for weeks. Right whales in the Atlantic feed on different krill species than southern right whales near Antarctica. Orcas in the Pacific Northwest hunt fish, seals, and sea lions, while orca populations in Antarctica hunt larger whales and penguins. Sperm whales diving in the deep Atlantic hunt different squid species than sperm whales in the Pacific. Location determines not only what prey is available but which hunting strategies individual whale families use effectively.

Different whale species use fascinating hunting techniques suited to their size and prey type perfectly. Baleen whales lunge feed, swimming open-mouthed through dense krill swarms and gulping massive amounts of water and prey at once. Humpback whales blow bubbles in circles around schools of fish to trap them before lunging upward to feed. Orcas hunt cooperatively in family groups, working together to chase prey and creating waves to wash seals off ice floes. Sperm whales dive to extreme ocean depths to hunt giant squid in complete darkness, using echolocation clicks to find and track prey accurately. Right whales feed differently, skimming through the water with their mouths open to filter tiny copepods from seawater. Pilot whales use echolocation and cooperative hunting to chase down squid and fish successfully. These complex hunting behaviors are passed down from mothers to calves within each population over many generations of whales.

Whale calves have completely different diets and feeding behaviors than the adults they will become. Calves survive entirely on their mother's milk for their first several months, which is extremely rich in fat and protein. Mother whales stop eating during nursing periods, using stored energy to produce milk for their growing calves. As calves grow older, they watch and learn from mothers and other pod members, starting to eat solid food like their parents do. Young baleen whales must learn the complex lunge-feeding technique used by their species through observation and practice over time. Orca calves learn specific hunting strategies from their mothers that are unique to each family group and often passed down for generations. In their first year, juveniles may eat smaller prey items or less frequently than adults until their hunting skills and knowledge are fully developed. This teaching period is critical for long-term survival in ocean environments.

As humans expand coastal development and ocean shipping, whales increasingly encounter human food sources and trash accumulation. Some whales have learned to follow fishing boats to steal freshly caught fish before they are hauled aboard. Entanglement in fishing gear both active and abandoned harms and kills many whales each year in fishing zones. Ship strikes from large vessels can injure or kill whales in busy shipping lanes near ports. Small whale populations near fishing areas may eat diseased fish or absorb pollutants through their food chain accumulation. Whale watching at California and other locations should always follow guidelines that keep boats at safe distances. Never interfere with natural feeding behavior during whale watching activities. Supporting regulations that reduce shipping speed in critical feeding areas and protect whale habitats helps these animals. Never feed whales intentionally as this causes them to lose natural fear of boats and vessels.

Whales occupy distinct feeding niches compared to other large marine predators in the ocean. Seals and sea lions are also marine carnivores but dive to much shallower depths than sperm whales and hunt smaller fish species. Dolphins are toothed cetaceans related to whales but are much smaller and typically eat smaller fish and squid. Sharks are large ocean predators but use very different hunting strategies and eat different size ranges of prey. Manatees and dugongs are large marine herbivores that graze on sea grass and algae rather than hunting animals. Baleen whale filter-feeding is essentially unique among large ocean predators worldwide. The combination of baleen whales' massive size and their ability to eat tiny organisms like krill creates a feeding strategy unlike anything else in nature. Find more about whale sounds to learn another way to identify these remarkable ocean giants and their behaviors.