Here are four extinct Florida Sea Cow [Manatee/Dugong] rib pieces in various sizes but with a bit different coloration due to the certain kinds of minerals found in the sediments that they were buried in...A white/tan color [fresh from the phosphate clays], another is black, while another is a deep brown, and finally an unusual bluish hue...

Kind of different...$15 plus $5 shipping! [$20 total]