The energetics of blue whale lunge feeding are modelled

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Work combining kinematic data from digital tags with unsteady hydrodynamic models produces an energy budget for individual lunges and foraging dives. Dives of about 3 to 15 minutes carry as many as six lunges; the energy returned by a mouthful of dense krill is very large relative to the cost, but the efficiency depends steeply on krill density. The result explains why the migration exists at all: a blue whale cannot make a living in ordinary water.

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