Shorebirds burn a lot of fat during their long migrations. This can release toxic chemicals that accumulate in fat cells.
The great tit and other birds can adapt to changes in their food supply as a result of climate change, but they run into trouble if the changes happen too quickly.
With some practice, you can learn to recognize some of the most common birds in northern Europe by their songs.
Flock status is crucial for small birds struggling to survive the winter. Those with the lowest status face tough odds.
A lot of birdwatchers like the bullfinch. They’ve probably noticed that the female can chase off the more colourful male from the bird feeder. That makes this species different.
The common redpoll gets into brawls when it seems like it should really be watching out for enemies. How can that end well?
A group of researchers spent twelve seasons making some house sparrows bigger and others smaller. Their experiment yielded some important answers.
Why do some sparrows hatch six chicks while others don’t hatch any? How does upbringing affect the remainder of their lives? Physiological stress in the nest can actually affect birds’ DNA and possibly their lifespan.
Common swifts are now slicing through the sky in Norway. Every year they fly the equivalent of four or five times around the Earth to return to their nesting areas.