How do you sleep when you’re in a three-dimensional space like the ocean? To complicate this, breathing for orcas is not an automatic function, as it is for us. Being mammals, they can only breathe at the surface, and must consciously open their blowhole to exhale.

Orcas overcome this by shutting down half of their brain at a time! With one half-awake, they can control breathing and movement while remaining somewhat alert to their environment. During such times they may be seen floating at the surface, a behavior called logging. Family groups may log together, this is known as a resting line.

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