OctopusAlthough they may appear scary, there is no evidence of an Octopus ever attacking a human being. According to One Kind Planet there are about three-hundred species of Octopus. They have three hearts to pump blood through their gills and body. On this page are six great black and white illustrations from a variety of old books. You might also want to glide over to the galleries with color images of Types of Octopus and Squid. Have fun!