<a href="//commons.wikimedia.org/wiki/Nyctalus_lasiopterus" title="Nyctalus lasiopterus">Nyctalus lasiopterus</a> showing its impressive teeth to the researchers
Popa-Lisseanu AG, Delgado-Huertas A, Forero MG, Rodríguez A, Arlettaz R, &amp; Ibáñez C
CC BY 2.5
<a rel="nofollow" class="external text" href="http://www.plosone.org/article/fetchArticle.action?articleURI=info:doi/10.1371/journal.pone.0000205">Popa-Lisseanu AG, Delgado-Huertas A, Forero MG, Rodríguez A, Arlettaz R, et al. (2007) Bats' Conquest of a Formidable Foraging Niche: The Myriads of Nocturnally Migrating Songbirds. PLoS ONE 2(2): e205. doi:10.1371/journal.pone.0000205</a>