Do fish sleep?
While most fish rest by reducing their activity and metabolism, the way fish “sleep” is different from the way land mammals sleep. Most fish don’t have eyelids, but they do…
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fish
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How do fish survive when ponds and lakes freeze?
When a lake freezes, only the top layer actually freezes over. The area beneath the ice is where fish survive. This is due to something called the anomalous expansion of water….