Archive image from page 106 of The dinosaur book the The dinosaur book : the ruling reptiles and their relatives dinosauruli13colb Year: 1945 m** CRETACEOUS GERHArtri- Restorations by John C. Gennann Four stages in the evolution of birds. The primitive bird, Archaeopteryx, had feathers and was probably able to fly, but in many details it was essentially reptilian. The Cre- taceous aquatic bird, Hesperornis, was com- pletely avian in structure, although it still re- tained the teeth of its reptilian forebears. In the Eocene period, giant ground birds such as Diatryma may have competed ser
Archive image from page 106 of The dinosaur book the The dinosaur book : the ruling reptiles and their relatives dinosauruli13colb Year: 1945 m** CRETACEOUS GERHArtri- Restorations by John C. Gennann Four stages in the evolution of birds. The primitive bird, Archaeopteryx, had feathers and was probably able to fly, but in many details it was essentially reptilian. The Cre- taceous aquatic bird, Hesperornis, was com- pletely avian in structure, although it still re- tained the teeth of its reptilian forebears. In the Eocene period, giant ground birds such as Diatryma may have competed seriously with the early mammals for dominance on the land. The modern birds are adapted for life in the treetops, on the ground, or in the water. (The tree depicted remained essentially the same) 103
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License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
