Chondrichthyans comprise 55 of the 94 vertebrate species found to date in the Mississippian marine Bear Gulch Limestone 6 km by 19 km tropical bay. The chondrichthyan-osteichthyan faunal proportions differ strongly from those of modern marine fish faunas. Secondary sexual dimorphism, size partiti...
Bird whistleGlazed ceramic whistle from the Tang dynasty (618–907 ce) or Five Dynasties (907–960 ce) period in China; in the Museum of East Asian Art, Bath, England. Similar whistles were popular in much of Asia during this time.(more) Clay whistles, often in the shape of birds, he...