Table 1. Details of datasets used to evaluate the form of the species abundance distribution.

Datasets marked as private were obtained through data requests to the providers.

Dataset	Dataset code	Availability	Total sites	Citation
Breeding bird survey	BBS	Public	2,769	Pardieck, Ziolkowski Jr & Hudson (2014)
Christmas bird count	CBC	Private	1,999	National Audubon Society (2002)
Gentry’s forest transects	Gentry	Public	220	Phillips & Miller (2002)
Forest inventory and analysis	FIA	Public	10,355	USDA Forest Service (2010)
Mammal community database	MCDB	Public	103	Thibault et al. (2011)
NA butterfly count	NABA	Private	400	North American Butterfly Assoc (2009)
Actinopterygii	Actinopterygii	Public	161	Baldridge (2013)
Reptilia	Reptilia	Public	129	Baldridge (2013)
Amphibia	Amphibia	Public	43	Baldridge (2013)
Coleoptera	Coleoptera	Public	5	Baldridge (2013)
Arachnida	Arachnida	Public	25	Baldridge (2013)