52.3 MB (3.5 MB compressed)
3672 x 4981 pixels
31.0 x 42.2 cm ⏐ 12.2 x 16.6 in (300dpi)
SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Archaeornithes reptile-like bird fossil. The Archaeornithes are an extinct group of the first primitive, reptile-like birds. They are an evolutionary transition between the non-avian dinosaurs and modern birds (the avian dinosaurs). This specimen dates from the Upper Cretaceous (100 million years ago to 66 million years ago).
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