Watch Now You Know: Why do fish swim against the current? Streaming Online | iwonder
Now You Know: Why do fish swim against the current?
Now You Know: Why do fish swim against the current?

Now You Know: Why do fish swim against the current?

1 min • Health & Science, Nature & Environment • 2018

In rivers, salmon face an up-stream battle towards spawning grounds where they lay their eggs. But why?
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