Every twenty minutes, an automatic reflex brings these sleeping seals to the surface for air. Their brain acts like a biological autopilot, allowing them to breathe and sink back down without ever waking up. This aquarium time lapse shows this behavior.
Seals sleep underater with a kind of auto-pilot.
Every twenty minutes, an automatic reflex brings these sleeping seals to the surface for air. Their brain acts like a biological autopilot, allowing them to breathe and sink back down without ever waking up.
This aquarium time lapse shows this behavior.
— Massimo (@Rainmaker1973) November 8, 2026
