Watch this video of the snail and compare it to Marcel, who is only a shell.  A snail is alive.  A story about a snail being more than a regular snail (think Gary in SpongeBob) would be an example of personification, not anthropomorphism.  

Soon you will write a short story about an anthropomorphic character.  I'm thinking this video is a love story :)  Probably not the kind of story you'll write...