Blue Whale

Scientific name: Balaenoptera musculus

Appearance & Identification:
The blue whale is the largest animal ever known to have lived on Earth. It has a long, streamlined body with a mottled bluish-grey coloration that can appear blue underwater. The head is broad and U-shaped with a prominent ridge running from the blowholes to the top of the upper lip. Its small dorsal fin is set far back on the body. When exhaling, blue whales produce an immense vertical blow up to 9 meters high.

Size & Lifespan:
Adults typically measure 24–30 m in length (some exceeding 33 m) and weigh 100–180 tons. Lifespans are estimated at 70–90 years, with some individuals possibly exceeding 100 years.

Habitat & Range:
Blue whales are found in all major oceans, preferring deep offshore waters. They migrate seasonally between high-latitude feeding grounds in summer and low-latitude breeding grounds in winter. Distinct populations exist in the North Atlantic, North Pacific, Indian, and Southern Oceans.

Feeding & Behaviour:
Blue whales are baleen whales that feed almost exclusively on tiny shrimp-like animals called krill. They can consume up to 4 tons of krill per day during peak feeding season. Feeding involves lunge-feeding, engulfing huge volumes of water and prey. Despite their size, they are generally solitary or found in loose associations.

Conservation Status:
Once driven close to extinction by commercial whaling, blue whales are now classified as Endangered. Populations are slowly recovering under international protection, but threats remain, including ship strikes, entanglement, noise pollution, and climate change impacts on krill availability.