To assess predictive performance of our model, we collected actual
U. thibetanus occurrence data. These additional observationswere gathered
fromnatural historymuseumdatabases, including data derived via
the Global Biodiversity Information Facility (http://www.gbif.org/) and
VertNet (http://www.vertnet.org) (Constable et al., 2010; Flemons
et al., 2007). Occurrences were placed on the binary map to establish
omission error rates and develop a cumulative binominal test of the statistical
significance of model predictions