Whales : Giants of the Ocean

Whales are among the largest and most remark­able ani­mals on Earth. These marine mam­mals live in oceans around the world, from warm trop­i­cal waters to the cold seas sur­round­ing the poles.

Life Beneath the Surface

Although whales spend their lives in water, they breathe air through blow­holes locat­ed on top of their heads. They must reg­u­lar­ly return to the sur­face to breathe before div­ing again in search of food or trav­el­ing through the ocean.

Whales are warm-blood­ed, give birth to live young, and nurse their calves with milk. A thick lay­er of fat called blub­ber helps pro­tect them from cold water and stores ener­gy dur­ing long migra­tions.

Two Main Groups

Whales are gen­er­al­ly divid­ed into baleen whales and toothed whales. Baleen whales fil­ter small ani­mals from the water using flex­i­ble plates inside their mouths. This group includes blue whales, hump­back whales, and gray whales.

Toothed whales use teeth to catch fish, squid, and oth­er prey. Many of them also use echolo­ca­tion, pro­duc­ing sounds and lis­ten­ing for return­ing echoes to under­stand their sur­round­ings. Sperm whales, bel­u­gas, and orcas belong to this group.

The Blue Whale

The blue whale is the largest known ani­mal to have ever lived. An adult can grow longer than a city bus and weigh well over one hun­dred tonnes. Despite its enor­mous size, it feeds main­ly on tiny crus­taceans called krill.

Communication and Migration

Whales com­mu­ni­cate using clicks, whis­tles, puls­es, and com­plex songs. Some sounds can trav­el across great dis­tances under­wa­ter. Hump­back whales are espe­cial­ly famous for their long, pat­terned songs.

Many species migrate thou­sands of kilo­me­tres each year. They often feed in cold, nutri­ent-rich waters before trav­el­ing to warmer regions where they mate and give birth.

Protecting Whales

Com­mer­cial hunt­ing once caused severe declines in many whale pop­u­la­tions. Today, whales also face threats from fish­ing gear, ship col­li­sions, under­wa­ter noise, pol­lu­tion, and changes to ocean ecosys­tems.

Con­ser­va­tion pro­grams, safer fish­ing prac­tices, pro­tect­ed habi­tats, and inter­na­tion­al coop­er­a­tion can help whale pop­u­la­tions recov­er. Pro­tect­ing whales also sup­ports health­i­er oceans because these ani­mals play an impor­tant role in marine food webs and nutri­ent cycles.