Southeast Alaska: Day 5, Orcas in the Chatham Strait

 

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An adult male Orca (Orcinus orca) in the Chatham Strait

During the afternoon of Day 5 we left Baranof Island and headed north through the Chatham Strait to Chicagof Island. On the way we sighted a trio of Orcas (Killer Whales) chugging north, alongside us within a few hundred yards of Chichagof Island’s eastern shoreline. They weren’t in any particular hurry, as they meandered mostly north, the M/V Sea Lion slowing to pace them. There was some good activity to watch as the adult female with the group repeatedly lobtailing/tail slapping the surface – a behavior seen a lot in the whales with social lives and structured cultures like the Orca.

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A female Orca lobtailing at the surface

It’s impossible to know exactly what is intended by the repeated lobtailing behavior – the meaning of signals like this can probably vary a great deal by context (were the other whales with this large female offspring? Or siblings? Was the large adult male we would encounter a mate? Or a stranger?) But the activity made for great watching. On the other side of the ship, a large male Orca (the one in the upper photo in this post) was seen. This whale seemed pretty comfortable around our ship, crossing under it a couple times so we got views of its right and left sides as we all puttered north, and even graced us with a breach. I did not, alas, manage to get a photo of the breach. That was a little bit of a downer, but only because I did not know what the evening of Day 5 would hold.

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