Enantiornithes is an extinct group of primitive birds. They were the most abundant and diverse avialans of the Mesozoic. Almost all retained teeth and clawed fingers on each wing, but otherwise looked much like modern birds externally. Over 50 species of Enantiornithines have been named, but some names represent only single bones, so it is likely ...
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http://en.wikipedia.org/wiki/Enantiornithes
Enantiornithes meaning opposite birds) were a group of toothless birds that evolved during the Cretaceous period. They ranged in size from a few inches to the size of a vulture. They evolved alongside modern-day birds, but were an evolutionary dead-end. Their name,meaning opposite birds, refers to the fact that their shoulder blade (scapula) and co...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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