Here at our mountain retreat, nestled in the emerald embrace of Costa Rica’s highlands, the sights and sounds are a symphony of life in the rainforest. But venture to our country’s stunning coastline, and a completely different bird ballet takes flight. Today, we set our sights on an elegant sky acrobat: the Common Tern (Sterna hirundo).

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While you won’t find these elegant birds gracing our mountain sky, a trip to Costa Rica’s Pacific or Caribbean coasts might allow you to glimpse their remarkable aerial performance. Common terns are migratory marvels, traversing continents in search of ideal feeding grounds. During their boreal winter (approximately November to April), these terns grace Costa Rica’s shores with their presence.

A Master of Diving:

The Common Tern is a medium-sized seabird, generally measuring around 33-39 cm in length. Its plumage is a study in contrasts: pearly white underparts shine against a pale gray back and wings. A black cap, topped with a white forehead, adds a touch of drama. But the true beauty of the Common Tern lies in its effortless flight. With slender, pointed wings and a deeply forked tail, it cuts through the air with the precision of a dancer.

A true hunter of the skies, the Common Tern is a master of the dive. Effortlessly gliding over the ocean’s surface, it searches for unsuspecting fish. Upon spotting its prey, the tern folds its wings and plunges headfirst into the water, a splash of white against the blue canvas. With a sharp beak and streamlined body, it is perfectly adapted to snatch fish from the depths.

A Social Spirit:

Unlike the solitary birds you might find at our mountain retreat, Common Terns are social creatures. They often gather in large colonies on sandy beaches or islands near the coast. The air above these colonies vibrates with their sharp calls, a constant chatter as they interact with one another.

The breeding season for Common Terns in Costa Rica is brief, generally occurring from March to May. They create shallow scrapes in the sand as nests, laying a clutch of 1 to 3 speckled eggs. Both parents share incubation duties, and the chicks, upon hatching, are precocious: they can leave the nest in a day or two.

Spotting a Common Tern:

If you’re lucky enough to visit Costa Rica’s coasts during the winter months, keep an eye out for these graceful birds. They are most commonly seen near the shore, often following schools of fish. Here are some tips for identifying a Common Tern:

• Look for a medium-sized tern with a black cap and white forehead.
• Notice its pale gray back and wings contrasting with pearly white underparts.
• Spot its characteristic forked tail and slender, pointed wings.
• Observe its agile flight, often gliding or diving low over the water.

While their stay in Costa Rica is temporary, the Common Tern adds a touch of wonder to our country’s coastal tapestry. Next time you find yourself by the ocean, take a moment to scan the horizon. You might witness the dazzling aerial ballet performed by this feathered acrobat.

Para obtener más información, consulte nuestra guía completa sobre las aves de Costa Rica.