Diel variation in beaked whale diving behavior

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Changes in spatial and temporal distribution and vocal behavior of Blainville's beaked whales (Mesoplodon densirostris) during multiship exercises with mid‐frequency sonar (2011, background): “They vocalize only during deep foraging dives which can exceed 1,000 m in depth, may last for more than 60 min, and occur approximately every 2 h (Tyack et al. 2006a, Baird et al. 2008).”
No shallow talk: Cryptic strategy in the vocal communication of Blainville's beaked whales (2012, background): “…by echolocation at depth and spending very little time at the surface, has been interpreted as an adaptation to reduce predation by killer whales (Aguilar de Soto 2006, Tyack et al. 2006, Baird et al. 2008) that have limited diving capabilities compared to beaked whales (Baird et al. 2005).”