A tradeoff between immunocompetence and sexual ornamentation in domestic fowl
These results support the idea that a tradeoff with immune function may constrain the expression of secondary sexual ornaments.

Genetic covariance between indices of body condition and immunocompetence in a passerine bird
The overall aim of this study was to test directly for genetic covariance between indices of body condition and immunocompetence in a small passerine bird, the zebra finch Taeniopygia guttata.

Video analysis of the escape flight of Pileated Woodpecker Dryocopus pileatus: does the Ivory-billed Woodpecker Campephilus principalis persist in continental North America?
The apparent rediscovery of the Ivory-billed Woodpecker Campephilus principalis in Arkansas, USA, previously feared extinct, was supported by video evidence of a single bird in flight

Ancient birds flew on all-fours
Bird flight evolved using front and hind limbs as wings, new fossil study argues

Grassland Birds Are Not Nesting In Non-Native Grasses
Populations of many grassland bird species have declined significantly in the last 30 years, according to breeding bird surveys

Progress in auditory hair cell studies in birds points way to possible human hearing improvement
Scientists have known for years that birds' ears do something human ears cannot: when hair cells in the avian ear are destroyed, the bird goes deaf only temporarily.

DNA research reveals new bird species in Colorado
Neither a tree-dweller nor a night bird, and roughly the size of a chicken, the Gunnison sage-grouse is not a particularly secretive bird yet just recently has it been identified as a new species of bird.

New bird species found in Idaho
New finch species demonstrates the co-evolutionary arms race

Mother Birds Give A Nutritional Leg Up To Chicks With Unattractive Fathers
Mother birds deposit variable amounts of antioxidants into egg yolks, and it has long been theorized that females invest more in offspring sired by better quality males.

Birds going extinct faster due to human activities
Human activities have caused some 500 bird species worldwide to go extinct over the past five millennia, and 21st-century extinction rates likely will accelerate to approximately 10 additional species per year unless societies take action to reverse the t