New paper! Lead author @noemiefreymond.bsky.social used a hybrid approach combining tag data & physical modelling to show that the timing & hydrodynamic effects of bubble releases by sperm whales during drift dives indicate deliberate & active buoyancy regulation, even during sleep.
Sperm whales rest in an unusual position, sleeping vertically underwater. In their recent paper, Freymond & co show that the whales blow bubbles in their sleep to keep themselves from shooting to the surface, letting them sleep soundly beneath the waves doi.org/10.1242/jeb....