Cassin's Vireo

Description

The vireo is 11–14 cm (4–6 inches) long. It has a grayish olive head, back, and flanks, with whitish underparts. One of its distinctive features is the solid white "spectacles" around its eyes, along with white wing bars. These markings set it apart from other similar species like the plumbeous vireo and the blue-headed vireo.

Behaviour

Cassin's vireo is known for its persistent song, which consists of short, rough-whistled phrases of several notes.These phrases are 2 seconds apart and often alternate between ending on high and low notes, creating a "question-and-answer" pattern. The Cassin's Vireo is known to sing for an extensive duration of time. Hearing a "cha-cha-cha" sound is a common indication of the Cassin's. Other types of birds are usually allured by a Cassin's Vireo's song. The vireo prefers to be in an open woodland in the western mountains and foothills. The open woods are also a preferred breeding location for the Cassin's Vireo. The bird is easily found in the middle to lower areas of the forest canopy, where it knowingly hunts for insects in the foliage.

Adapted from Cassin's vireo on Wikipedia, used under CC BY-SA 4.0.