Date: August 1, 2018
Source: American Ornithological Society Publications
Office
As might be expected for a
recently discovered bird species in the continental United States -- only the
second in nearly 80 years -- the Cassia Crossbill (Loxia sinesciuris) is range-restricted. It occurs in just two small
mountain ranges on the northeast edge of the Great Basin Desert where it is engaged
in a coevolutionary arms race with lodgepole pine. Based on a current paper
in The Condor: Ornithological Applications, Cassia Crossbills occupy about
70 km2 of lodgepole pine forest and number only ~5,800 birds.
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