Sei Whale

PHYSICAL DESCRIPTION

Sei whales have a large, slender body that can measure up to 19.5 metres in length. They are dark grey on the upper side with a light underside and often have circular scars on the skin which are thought to be caused by predators or parasites.The dorsal fin is relatively large and curved, and is positioned about two-thirds along the body. Sei whales do not raise their tail flukes above the water when diving. The blow is tall and columnar and is visible at the same time as the dorsal fin when the whale surfaces.

BEHAVIOUR

Sei whales commonly travel alone or in small groups, although they can occur in larger groups where food is abundant. They are among the fastest of the large whales, capable of reaching speeds of 30 mph in short bursts and can occasionally breach.

HABITAT AND DISTRIBUTION

The global distribution of sei whales is unpredictable and poorly understood. They occur throughout all major oceans worldwide, except the polar regions, although they are known for their sudden influxes to an area and subsequent disappearances. Migration patterns and population divisions are also poorly understood. Sei whales are predominantly an offshore species. They are rarely seen in Hebridean waters and reports include stranded animals.