I’ve been looking up about Orcas, and I realized, how the hell do fish know where they are going in the middle of the ocean when there are no physical markers? It’s just water in every direction and depths so deep you cant see the bottom. I need google maps and I’ll still get lost. Is it something about magnets?
In: Biology
>when there are no physical markers?
There are a lot of markers under the water. Humans are just not equipped to use them. Similar as some birds can “see” and use air thermals to raise/lower altitude.
Think of water temperature or salinity (content of salt). Or big changes in the depth.
Other way of orientation (that exclude the sun and stars) are earth magnetic field and in the case of whales/dolphins/orcas the famous “ecolocation” (sonar) system.
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