Los vuelvepiedras rojizos ( Arenaria interpres) destacan sobre las aves playeras. Al emprender el vuelo, el vuelvepiedras despliega un vívido e inconfundible patrón de franjas oscuras y claras a lo largo de sus alas y cola. Y ese parloteo tan cómico es único en su tipo. A diferencia de la…

Beaks suited for opening tough, hard seeds — thick, conical beaks — evolved in more than one lineage of birds. Rose-breasted Grosbeaks are related to cardinals, which also have powerful beaks. Evening Grosbeaks belong to the finch family, which includes goldfinches and crossbills — an…

Ross’s Geese and Snow Geese are both white-bodied waterfowl with black wingtips that can be difficult to tell apart. The pair are a great example of what science calls sister species, which occur when a portion of one species takes an evolutionary step away from the rest, resulting in a…

Found in the Sierra Madre, the Arizona Woodpecker has a special connection to the mountain range. Sharing mid-elevation pine and oaks with fellow border straddlers, these small brown birds with white and brown cheeks stand out from other Woodpeckers with their heavily marked white…

La forma en que algunas aves sacuden, agitan o despliegan la cola puede ser muy característica. Una cola que se sacude o se despliega con rapidez puede sugerirle a un depredador que el ave está especialmente alerta o que no será fácil de atrapar, y al mismo tiempo, puede advertir al resto…

Some bird songs leave us in admiration of their beauty, some with a sense of wonder at their complexity—and others are downright comical. As a maker of silly sounds, the male Willow Ptarmigan beats the Three Stooges hands down. But these sounds are no laughing matter. Where it nests in the…

Owls have a reputation for hooting and hunting at night. But when you take a look – and listen – to the 19 species that live in the U.S. and Canada, it’s clear that these raptors defy stereotypes.

Bird feeders and birdbaths are great ways to attract birds to your yard, but they aren’t the only ways to entice our feathered friends. Planting an area densely with native shrubs, trees, and other vegetation can create a natural look that some birds are more likely to feel at home in…

Most birds molt and regrow their flight or wing feathers — one at a time along each wing — to stay in prime condition for flying. But for a Wandering Albatross, with a whopping 10-to-12-foot wingspan, that’s a big job! It takes the large albatrosses a full year to molt, and they have to…

The ability to fly seems to define birds. But there are more than 50 species of flightless birds throughout the world — from the Ostrich and Kiwi to flightless rails, ducks, and this Humboldt Penguin. Why did they evolve the inability to fly? Many dwelt on islands. Others evolved until…