Animals with out a backbone or a spinal column

Sea urchin
have spikes that can stick you! Owwwwww ouchy ouch, that hurts a lot! 
WHY DO THEY HAVE spikes? They have spikes because it protects the animals from harm!

There are over 300 species of squid around the world. They can be in many colors and sizes

is a germ that can be helpful to people. The germ can make the person sick or die if not used properly.  

YouTube Video

Subpages (1): Vertebrates