It's not hard to tell from these photos why this bird is called a Red-eyed Vireo. They are more often heard than they are seen. This species has a reputation for singing incessantly during the breeding season even during the middle of the day when many songbirds are silent. They can be hard to see once the trees are in full foliage since their olive green plumage blends in well with their habitat. So if you hear a bird singing non-stop in the trees near where you live consider the possibility it may be this one. Many people are familiar with the song of the American Robin - vireos have a similar repetitious song. June 4, East Jordan.