@article{smith2020,
  author = {Smith, A. B.},
  title = {Penguin Behavior: A Comprehensive Review},
  journal = {Journal of Penguin Studies},
  year = {2020},
  volume = {15},
  pages = {123-135},
}

@article{jones2018,
  author = {Jones, C. D.},
  title = {Penguins and Climate Change: An Overview},
  journal = {Environmental Science Review},
  year = {2018},
  volume = {8},
  pages = {45-58},
}

@article{brown2015,
  author = {Brown, E. F.},
  title = {Sexual Dimorphism in Bill Lengths of Penguins},
  journal = {Journal of Ornithology},
  year = {2015},
  volume = {20},
  pages = {67-79},
}

@article{wilson2019,
  author = {Wilson, G. H.},
  title = {Foraging Strategies in Male and Female Penguins},
  journal = {Behavioral Ecology},
  year = {2019},
  volume = {25},
  pages = {102-115},
}