Digestive physiology is a determinant of foraging bout frequency in hummingbirds

@article{Diamond1986DigestivePI,
  title={Digestive physiology is a determinant of foraging bout frequency in hummingbirds},
  author={Jared M. Diamond and William H Karasov and Duong Hieu Phan and F. Lynn Carpenter},
  journal={Nature},
  year={1986},
  volume={320},
  pages={62-63}
}
Hummingbirds are among the smallest endothermic vertebrates. Because they forage by energetically costly hovering, and because weight-specific basal metabolic rates increase with decreasing body size, their basal and active metabolic rates are among the highest recorded. Hummingbirds fuel these metabolic requirements mainly with highly concentrated sugar in nectar, which they extract rapidly and efficiently1,2 by an unknown mechanism. It is especially puzzling that, despite their high energy… CONTINUE READING