2-2 Short Answer: Describing Evidence
The specific data that is discussed in the article I chose is called Menzerath's Law, is a linguistic law that and songbirds tend to use shorter elements like words or sounds when putting together longer phrases There were no additional research studies discussed in the article, I am also able to get more information on the original research if needed.
The information comes from a journal Logan S. James, Chihiro Mori, Kazuhiro Wada, Jon T. Sakata. Phylogeny and mechanisms of shared hierarchical patterns in birdsong. Current Biology, 2021 ; DOI: 10.1016/j.cub.2021.04.015. I do feel like the information presented is valid and reliable.