Spawning salmon were trapped in this lake in the Yukon by a landslide long ago. After thousands of years, and thousands of generations,  they still migrate from one end of the lake to the other, trying to reach the sea.
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I still feel a strange urge when the leaves start to turn, like I'm trapped inside and need to go outside.

https://cdn.fosstodon.org/media_attachments/files/111/174/278/889/361/105/original/4311360e4bcab602.jpeg

https://cdn.fosstodon.org/media_attachments/files/111/174/279/252/236/198/original/8704a7a3f2fe732a.jpeg