Red-eyed Vireos [Vireo olivaceus] are extremely common in the summer yet sometimes hard to spot. Luckily, they tend to call for hours. “One enthusiastic Red-eyed Vireo was recorded singing more than 27,000 times in one day” – The Young Birder’s Guide to Birds of Eastern North America.
In northern Illinois we have seven regularly occurring species of vireos. In the U.S. there are 14. Each of these vocal vixens are often heard more than seen as they sluggishly skulk in the shrubbery. Problem is, their sounds are often similar, so identifying them can be a bit tricky. White-eyed Vireos might hide a