<i><a href="https://en.wikipedia.org/wiki/en:Botaurus_lentiginosus" class="extiw" title="w:en:Botaurus lentiginosus">Botaurus lentiginosus</a></i> (American Bittern) bill, natural size.
Amos W. Butler
2011-09-21
<i>A catalogue of the birds of Indiana</i> by Amos W. Butler. 1891. <a rel="nofollow" class="external free" href="https://www.biodiversitylibrary.org/bibliography/14085">https://www.biodiversitylibrary.org/bibliography/14085</a>