Ammonites are an extinct group of marine invertebrate animals which died out at the end of the Cretaceous period (65 MYA), and date back as far as 240 million years ago during the Paleozoic era. They had eyes, tentacles, and a sharp bird-like beak which they used to rip apart their prey. These specimens were collected in Madagascar, and are about 2 to 3 inches in diameter. They have been sliced in half to reveal the different chambers inside the shell. Get yours today!!