To cite package ‘birdcolors’ in publications use:

  Tonelli B, Youngflesh C (2026). _birdcolors: Create Palettes from the
  Colors of the World's Birds_. R package version 1.0.1,
  <https://github.com/bentonelli/birdcolors>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {birdcolors: Create Palettes from the Colors of the World's Birds},
    author = {Benjamin Tonelli and Casey Youngflesh},
    note = {R package version 1.0.1},
    year = {2026},
    url = {https://github.com/bentonelli/birdcolors},
  }