Scientists at Yale University have tagged the embryonic femurs of some reptiles and the chicks of several bird species with specific antibodies that bind to proteins from developing cartilage, bones, skeletal muscles and nerves. They then created 3D images of the pelvic bones, muscles and nerves.
Visualization showed that the avian pelvis in embryos first looks like a “general reptilian”, then like a “dinosaur” and only then becomes “avian”.
