Here at our mountain retreat, nestled amidst the emerald embrace of Costa Rican rainforests, we’re surrounded by a symphony of birdsong. Today, we turn our binoculars to a frequent flyer in the lush canopy – the Red-eyed Vireo (Vireo olivaceus).

While not as common a resident as the Yellow-green Vireo, the Red-eyed Vireo is a fascinating visitor gracing our mountain forests during its migratory journey. Let’s delve into the world of this little songbird!

A Dashing Dodger

The Red-eyed Vireo is a small, olive-green songbird, typically measuring 4.5-5 inches. Its defining feature, the red eye, might not always be readily apparent. Juveniles, for instance, sport brown eyes that mature to red over time. A dark stripe through and above the eye further accentuates the gaze.

Unlike its leisurely yellow-green cousin, the Red-eyed Vireo is a ball of tireless energy. It flits persistently through the upper foliage, meticulously gleaning insects and spiders from leaves and branches. Its acrobatic maneuvers are a marvel to watch, as it contorts and hangs upside down to reach every nook and cranny.

A Song Unsung (…Almost)

Up north, birders are well-acquainted with the Red-eyed Vireo’s delightful melody – a series of clear, whistled phrases. Here in Costa Rica, however, their focus is firmly on migration. They become relatively quiet, their energy channeled towards reaching their South American wintering grounds.

But listen closely! On occasion, particularly during their spring migration window (roughly June to August), you might be lucky enough to catch a snatch of their song, a sweet reminder of their summer homes.

A Case of Mistaken Identity

Identifying the Red-eyed Vireo in Costa Rica can be tricky. The Chivi Vireo, a very similar South American species, can occasionally wander into Costa Rican airspace. The key differentiators are subtle: a slightly yellower undertail and a darker eye in the Chivi.

So, if you spot a Red-eyed Vireo during its migratory pitstop in our mountain retreat, congratulations! You’ve encountered a bird that has likely traveled thousands of miles. Keep your eyes peeled for the flash of red in the foliage, and if you’re patient, you might even be rewarded with a fleeting glimpse of this remarkable avian traveler.

Interested in learning more about Costa Rican birds? Stay tuned for our next blog post as we explore another feathered friend!

For more information, please view our comprehensive guide about the birds of Costa Rica

This post is also available in: Français (French) Español (Spanish)