Theropod-bird link reconsidered : Abstract : Nature

Many birds show plumage patterns in that are invisible to the human eye; some birds whose sexes appear similar to the naked eye are distinguished by the presence of ultraviolet reflective patches on their feathers. Male have an ultraviolet reflective crown patch which is displayed in courtship by posturing and raising of their nape feathers. Ultraviolet light is also used in foraging— have been shown to search for prey by detecting the UV reflective urine trail marks left on the ground by rodents. With the exception of pigeons and a few other species, the eyelids of birds are not used in blinking. Instead the eye is lubricated by the , a third eyelid that moves horizontally. The nictitating membrane also covers the eye and acts as a in many aquatic birds. The bird has a fan shaped blood supply system called the .

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There is no doubt that Archaeopteryx is unique. It had a generally reptilian skeleton with a tail made up of extended vertebrae, teeth, and claws on its wings. But it also had 100% modern feathers showing the asymmetry of flight feathers. It is considered the first bird, but those advocating the dinosaur–bird link want to make Archaeopteryx a feathered dinosaur. In fact many of the so-called feathered dinosaurs resemble Archaeopteryx.

Feathery Fossil Hints Dinosaur-Bird Link - The New York Times

Linkage to birds ... and more? Cornell has an amazing collection of bird sounds. Greg Budney show’s you inside the library Bird songs from the Americas and around the world. here.
An wide selection of bird sound with a few sentences about each.
– European Birds Songs, Calls and Sonagrams.
– an impressive array of links to bird sounds sites.
Bird Life International’s Bird Links to the World – . Many links to world sounds.
Learn to and lots more!
Also read about a great app from Pocket Chirp for making on your iPhone.
From the Oakland Museum

New Dinosaur-Bird Link? | Answers in Genesis

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Ancient Feathered Animal Challenges Dinosaur-Bird Link - ScienceDaily