Figure 1. Vertebrate wings. Two possible shape reconstructions are given for pterosaurs In this lab you will be examining some of the finest fossils known of these groups. Due to their small size, delicate structure and lightened bones, these organisms are quite rare in the fossil record. The best specimens are often preserved in marine sediments, though that does not necessarily mean that they spent time in the water (remember Compsognathus and the pterosaurs of the Solnhofen?). Section A. Modern Birds 1) [1 point] Name 3 skull fenestra or openings still present on the skull in specimen A1