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| ▲ | chmod775 4 days ago | parent [-] | | Nice water flows downstream, terminates in the ocean. They simply follow it back upstream. | | |
| ▲ | jagged-chisel 4 days ago | parent | next [-] | | I’m with you on this. Found some tasty water? Swim towards it. It gets tastier the further we go? Keep going. | | |
| ▲ | rightbyte 4 days ago | parent | next [-] | | So how do they find the river outlet into the ocean? There surely is some bird compass thing involved. I am only half joking when I write that Venus guides them. That nature works at all is astonishing. | | |
| ▲ | jaggederest 4 days ago | parent | next [-] | | It's all chemoception, the same as with single cell organisms. They swim towards a saline gradient ( which they can taste, for sure ) and follow it up into fresher and fresher water. | |
| ▲ | bad_haircut72 4 days ago | parent | prev [-] | | Word gets around? Animals probably have way better communication than we think. One crab says to a friendly eel "hey dont tell those damn Salmon but this estuary is good again" and before you know it, everyone's favourite restaurant is booked out till March. | | |
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| ▲ | monknomo 4 days ago | parent | prev [-] | | Yeah, no need to make this complicated. |
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| ▲ | Angostura 4 days ago | parent | prev [-] | | Thanks, I was bang my head on this one, until you suggested a nice simple solution |
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