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Home > Grizzly Bear and Wildlife Tour Blog > Whale Watching > Porpoising 1 of 2

Porpoising 1 of 2

September 12, 2015 Lodge Guide

Two definitions for the same activity take your pick I know the one I like. In this case a pacific whitsided dolphin is porpoising.

From Oxford Journals “Porpoising is the popular name for the high-speed surface piercing motion of dolphins and other species, in which long, ballistic jumps are alternated with sections of swimming close to the surface. The first analysis of this behavior (Au and Weihs, 1980) showed that above a certain “crossover” speed this behavior is energetically advantageous, as the reduction in drag due to movement in the air becomes greater than the added cost of leaping.”
Or Porpoising Definition – Birding and Wild Birds – About.com (verb) The act of leaping in and out of the water in a short, shallow arc while swimming.

Bald Eagles

Bald Eagles are frequently sighted in our area. At times they can be seen in large numbers. This is usually where food supplies are high. For example this could be in areas with high concentrations of baitfish or along the rivers in the fall when the salmon are spawning. They are not migratory, but do move around with the food supply. As mentioned earlier when the salmon are spawning we often see many along the rivers, while there will be fewer along the coastline. With little need for camouflage their white head and tail feathers can be spotted easily. The female is slightly larger and her white head extends down a bit farther onto the body, but it is subtle. It takes these birds 4.5 – 5 years to acquire this unique plumage. As juveniles they are a brown colour. With exceptional eyesight and the ability to view 270 degrees they are understandably often seen in high perches and in trees near points and passageways.

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