Whale Moms Flip for Rest: Study Reveals Unique Behavior

Researchers have discovered a unique resting behavior in southern right whale mothers: they lie upside-down at the ocean surface. This behavior, observed during long migrations between Australia and Antarctica, is not indicative of illness or injury.

Instead, the study suggests this practice allows mothers to conserve energy and avoid overheating. It also prevents calves from accessing mammary slits, giving mothers a much-needed break from nursing. Approximately 25% of mothers tracked exhibited this behavior for nearly a fifth of the observation time.

Southern right whales undertake demanding migrations and are capital breeders, relying on stored blubber for energy. The upside-down posture may help mothers cool down by exposing their bellies and fins to the sea breeze, a vital adaptation for whales lacking dorsal fins for thermoregulation.

While this upside-down resting is an educated guess by researchers, it highlights the energy demands of whale motherhood. The study emphasizes the importance of giving these animals space, especially as their populations recover from historical whaling. This behavior underscores the challenges of raising young whales during their energetically intensive life stages.