Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations?

@article{Sato2004WhyDM,
  title={Why do macaroni penguins choose shallow body angles that result in longer descent and ascent durations?},
  author={Katsufumi Sato and Jean-Beno{\^i}t Charrassin and C Bost and Yasuhiko Naito},
  journal={The Journal of experimental biology},
  year={2004},
  volume={207 Pt 23},
  pages={4057-65}
}
It is generally assumed that air-breathing aquatic animals always choose the shortest route to minimize duration for transit between the surface and foraging depth in order to maximize the proportion of time spent foraging. However, empirical data indicate that the body angles of some diving animals are rarely vertical during descent and ascent. Why do they choose shallower body angles that result in longer descent and ascent durations? To investigate this question, we attached acceleration… CONTINUE READING
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