Embarking for their daily visit to look for birds at Portage Park ... had spotted a white wagtail, a species common in Europe and Asia but rarely found in North America. The Dec. 28 sighting ...

The cheery and sociable house sparrow is more closely associated with humans than any other widely established North American exotic. Introduced to New York City in 1851, the species today ...

Researchers analysed 70,716 specimens from 52 North American migratory bird species collected over 40 years. The birds had died after colliding with buildings in Chicago, Illinois. The authors say ...