Understanding Your Cat's Body Language
Through body language and demeanor your cat is a skilled communicator. Here's how to
read the non-verbal messages your cat is communicating:

On Patrol Of Her Territory 1. Perked ears indicate curiosity 2. Tail provides balance 3. Whiskers measure width 4. Sebaceous glands secrete an oily substance with a distinct smell 5. Paws planted firmly and confidently on the ground 6. Paw pads act as shock absorbers
Ready To Take Action 1. Tail acts as a counterbalance as center of gravity shifts forward 2. Smooth body fur indicates confidence 3. Forward ears show assertiveness 4. Dilated pupils indicate excitement 5. Concentrated expression 6. Hind legs bent, ready for action
Relaxed and Content 1. Each whisker is used for sensory perception 2. Direct eye contact demonstrates trust 3. Tail in relaxed position 4. Slanted eyes indicate contentment 5. Nose pad receptors 6. Ears always attentive

Source: www.purina.com/cats/behavior/CatBodyLanguage.aspx