Nutcracker
Stop Brexit!
Audubon named a bird from 1811 Sylvia carbonata Audubon 1829, pl. 60 Carbonated (Swamp) Warbler.
http://www.sibleyguides.com/2008/03/audubons-mysteries-carbonated-swamp-warbler .
Perhaps he mistook swamp gas bubbling up under the bird for CO2 . .. 3