Why are some cats outgoing and others standoffish? Why are some dogs adventuresome and others homebodies? As any pet owner can attest, we feel that the animals we've formed bonds with are unique. But is there any scientific basis for this feeling, or are we just projecting our complicated human ideas onto the animal world? The array of personality types among all species is only beginning to be described and understood, and here John Shivik shares examples of individuality in wolves, bears, crabs, bluebirds, and even microscopic organisms.