A new study showing Antarctic krill sink when their stomachs are full has provided indirect evidence that krill undergo multiple daily vertical migrations. Such behavior could make a significant contribution to carbon sequestration by the deep oceans.
Swadling, K. M. (2006, March 7). Krill migration: Up and down all night. Current Biology. https://doi.org/10.1016/j.cub.2006.02.044