Definition: A taxon is Least Concern when it has been evaluated against the criteria and does not
qualify for Critically Endangered, Endangered, Vulnerable or Near Threatened. Widespread
and abundant taxa are included in this category.
Definition: Sounds produced by organisms through the use of a larynx, syrinx, or other evolutionarily homologous organ located in the neck.
Attribution: Lima‐Rodrigues, M., Valle‐Fernandes, A., Nunes, R., & Almeida, A. (2006). Distribution of neuromuscular junctions in laryngeal and syringeal muscles in vertebrates. The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology, 288(5), 543-551.
Definition: Organism produces a vocalization that is either structurally more complex or that serves a different function (namely, being used in courtship or pair bond maintenance) than any vocalizations described for that organism that are referred to as "calls" in the literature.
Attribution: Odom, K. J., Hall, M. L., Riebel, K., Omland, K. E., & Langmore, N. E. (2014). Female song is widespread and ancestral in songbirds. Nature communications, 5.