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Stand in the shallow part of Hanauma Bay in Hawaii. The water is extremely warm, then very cold as a current comes in. Move around. The fish stay the same but the temperature varies drastically. The fish don't seem to notice and they don't stop eating.
My skin is not an accurate thermometer but I know what it feels like to me.
In tide pools on the same island when high tide fills it up the water is cold. As the day goes on the sun heats the water up a lot. There are corals and invertebrates that are active through both extremes.
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