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Many specimens preserve a pair of long, narrow tail feathers, which grew longer than the entire length of the rest of the body. Unlike the feathers of most modern birds, these feathers were not differentiated into a central quill and barbs for most of their length. Rather, most of the feather formed a ribbon-like sheet, about six millimetres wide.
Knowledge of the origin of feathers developed as new fossils were discovered throughout the 2000s and the 2010s, and technology enabled scientists to study fossils more closely. Among non-avian dinosaurs, feathers or feather-like integument have been discovered in dozens of genera via direct and indirect fossil evidence. [2]
Motmots often move their tails back and forth in a wag-display that commonly draws attention to an otherwise hidden bird. Research indicates that motmots perform the wag-display when they detect predators (based on studies on turquoise-browed motmot ) and that the display is likely to communicate that the motmot is aware of the predator and is ...
This category contains non-avialian dinosaur genera that have been shown by fossil evidence to have been feathered. Primitive birds belong in Category:Prehistoric birds, though transitional fossils may belong in both.
In all examples, the evidence described consists of feather impressions, except those genera inferred to have had feathers based on skeletal or chemical evidence, such as the presence of quill knobs (the anchor points for wing feathers on the forelimb) or a pygostyle (the fused vertebrae at the tail tip which often supports large feathers). [1]
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Family of theropod dinosaurs Dromaeosaurids Temporal range: Cretaceous Pre๊ ๊ O S D C P T J K Pg N A collection of dromaeosaurid fossil skeletons. Clockwise from upper left: Deinonychus antirrhopus (a heavily built eudromaeosaur), Buitreraptor gonzalezorum (a long-snouted unenlagiine ...
Samples of San Francisco wastewater tested positive for bird flu; authorities have yet to determine the source.
The resplendent quetzal (Pharomachrus mocinno) is a small bird found in Central America and southern Mexico that lives in tropical forests, particularly montane cloud forests. They are part of the family Trogonidae and have two recognized subspecies , P. m. mocinno and P. m. costaricensis .