Evolution of feathers,artwork

Numéro d’image : 11678377
Evolution of feathers,artwork
Evolution of feathers. Artwork showing the evolution of feathers in dinosaurs and birds,from primitive forms at left,to forms more adapted to flight at right. At far left is a hollow filament or spine. This was followed by filamentous forms (centre left). At centre,a primitive feather has a central rachis but the barbs are not joined. At centre right is a pennaceous feather,the type found in modern birds. This one is symmetrical about the central rachis and the barbs are joined together. At far right is a pennaceous feather that is non-symmetrical about the central rachis. This evolution took place over tens of millions of years (Jurassic to Cretaceous)
Licence : Droits gérés
Crédit: Science Photo Library / Jensen, Mikkel Juul
Taille de l’image : 4806 px × 1819 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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