Increase in trees in the Great Plains from fire suppression or tree planting is considered a main cause of the range expansions of many other species of birds including western kingbird ( " Tyrannus verticalis " ), eastern phoebe ( " Sayornis phoebe " ), eastern bluebird ( " Sialia sialis " ), blue jay ( " Cyanocitta cristata " ), brown thrasher ( " Toxostoma rufum " ), red-tailed hawk ( " Buteo jamaicensis " ), and American crow ( " Corvus brachyrhynchus " ).
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