Blue Whales are biggest animal on earth (ever!)

The blue whales we see in Geographe Bay are mostly pygmy blue whales. They are shorter than the Antarctic blues seen elsewhere.

Back of Blue Whale

Blue whales do not have the reserves of fat that other species do and migrate from food source to food source. Satellite tracking of these Blue whales has shown that they winter in Indonesian waters, and calve there. They travel down the West Australian coast and pass through Geographe Bay from early September to December. We know some of them have been feeding north of Geographe Bay as we have filmed multiple instances of them defecating in Geographe Bay.

Blue whale defecating in Geographe Bay – Yellow is not the normal colour.

They continue to follow the coast all the way around to the Otway upwelling on the edge of the continental shelf between South Australia and Victoria. They also feed near Kangaroo Island.

Later in summer they start their northward migration again, travelling along the south coast towards Augusta, and then north to the Perth Canyon. They have to brave the Orcas at Bremer Bay on this journey. The tour boats operating out of Bremer Bay have seen several instances of Orcas killing blue whales at this time. They feed on krill at the Perth Canyon, and then continue on to Indonesian waters to repeat the cycle.

Other populations of blue whales have different migratory patterns. Some do not migrate at all when they have adequate food year round. The blue whales seen south of Sri Lanka remain there all year round for example.

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