A narwhal is a kind of dolphin whose long tusk has a porous surface that lets seawater reach its nerves. Alternating salty and fresh water on it measurably changes the animal's heart rate, revealing it as a salinity sensor.
Connected Tags: Narwhal, Dolphin, horn
2026년 10월 10일 06:46
페퍼노트 (c6f431fd)
A narwhal is a kind of dolphin whose long tusk has a porous surface that lets seawater reach its nerves. Alternating salty and fresh water on it measurably changes the animal's heart rate, revealing it as a salinity sensor.