A male Olive-backed Euphonia (
Euphonia gouldi), photographed in Costa Rica.
Birds spend a lot of time and energy singing, but they don't do it the same way in every season of the year. And some can't sing at all. What's the purpose of birdsong?
European bee-eater (Merops apiaster)
Even in the breeding grounds, we found that European bee-eaters preferred the company of some birds over others. These tended to be the individuals they migrated with.
A pair of Seychelles Warblers tend to their chick.
Janske Van De Crommenacker
Why some individuals age faster than others is a mystery, but new research suggests help with childcare is significant.
Yolks are a great source of vitamins, minerals, fats and proteins packaged up by the female animal for an embryo.
Emily Nunell/The Conversation CC-NY-BD
A yolk allows a developing animal to stay in an egg longer, boosting its chance of survival. The downside is the mother has to work hard finding extra food so her body can create a nutritious yolk.
Osprey on a nesting platform in Massachusetts.
Chemical pollution and hunting pushed Ospreys to the edge of extinction in the mid-20th century. Today, they have rebounded and can be spotted worldwide, often nesting on manmade structures.
Robins are a much loved Christmas icon, but wind turbines installed in their habitat are affecting their song, with worrying consequences.
Do you know this downy woodpecker?
By looking closely at traits like wing feathers and spot patterns, a computer scientist trained an algorithm to recognize individual woodpeckers.
On the fence.
As both beneficiary and victim of EU policies, yellowhammers are apt symbols for Brexit's divisions.
Birds don’t fly across wide Amazonian rivers like the Rio Negro.
Marcos Amend www.marcosamend.com (for use with this article only)
Rivers are natural boundaries for evolving populations. But scientists don't agree whether they create new species or just help maintain them. Research using birds' molecular clocks provides some answers.
Both male and female birds sing to impress other birds, but as well as that, they do it for pleasure!
London should be one giant pigeon cemetery, but you rarely see the bodies.
A white-throated swallow, one of several intra-African migratory birds.
There are hundreds of variations on the basic 'flavour' of bird migration.
John James Audubon’s ‘Carolina Parakeets.’
The last Carolina parakeet died in a zoo a century ago. A scientist tries to unravel some of this bird's lasting mysteries.
Marcella Cheng/The Conversation
To stay up, the bird must overcome gravity with a force called 'lift'.
New research explains why habitat loss means male willow warblers now outnumber females – and that's bad news for the species.
Annoying, right? A juvenile Noisy Miner.
Andrew Haynes/Wikimedia Commons
There are birds we love to hate, such as the Noisy Miner. But much of the annoying behaviour on show may be a result of human-induced changes to habitats.
Two new species of owl have been confirmed in the Philippines. Researchers had been aware for some time of new subspecies…
A study of green-rumped parrotlets found that adopted chicks use the names given to them by their foster parents, suggested naming is learned rather than hard-wired.
Wild parrots name their chicks by teaching them an individual sound to identify them, researchers have found. Humans and…
A study of blue-footed boobies found that while siblings bully each other badly in the nest, the youngsters grow into adults with normal levels of aggression.
Harsh sibling bullying maybe tough to endure as a youngster but victims won’t necessarily grow into cowed and meek adults…