Previous Year Question

The Sperm Whale is the Largest Toothed Whale in the world. Its scientific name is Physeter macrocephalus, and it belongs to the Odontoceti group of the order Cetacea. Adult male Sperm Whales can generally reach lengths of approximately 16–18 metres and may weigh around 40 tonnes or more. Male Sperm Whales are considerably larger than females, a characteristic known as Sexual Dimorphism. Their most distinctive structural feature is their enormous head, which may account for approximately one-third of their total body length.

Whales are mainly classified into two groups—Toothed Whales (Odontoceti) and Baleen Whales (Mysticeti). Toothed Whales include Sperm Whales, Orcas, Belugas, and various dolphins. They generally hunt fish, squid, and other marine organisms. In contrast, Baleen Whales possess Baleen Plates made of Keratin instead of teeth. These plates allow them to filter Krill, plankton, and small fish from seawater. The Blue Whale is the largest living animal in the world, but it belongs to the Baleen Whale group rather than the Toothed Whale group.

Sperm Whales use Echolocation to hunt in deep ocean waters. Their heads contain a Spermaceti Organ filled with a wax-like substance that is associated with the production and focusing of sound. Sperm Whales produce powerful Click Sounds and use their echoes to detect prey and surrounding objects in dark ocean environments. They routinely dive to depths of approximately 600 metres or more, and their dives may last around 45 minutes. Their primary diet consists of Squid, including Giant Squid. They also consume fish and other marine organisms inhabiting deep ocean waters.

Among the other species, the Fin Whale (Balaenoptera physalus) is the second-largest whale species after the Blue Whale and belongs to the Baleen Whale group. The Blue Whale (Balaenoptera musculus) is the largest animal known to have existed on Earth, reaching lengths of approximately 30 metres. The Humpback Whale (Megaptera novaeangliae) is also a Baleen Whale, renowned for its long Pectoral Fins, distinctive Whale Songs, and Breaching behaviour. These three species primarily filter food through Baleen Plates, whereas the Sperm Whale hunts in deep ocean waters using teeth and Echolocation.