- Have excellent night vision, and can see well at one-sixth of the light level required for humans.
- Have excellent hearing and can hear higher-pitched sounds than both dogs and humans. The cat's hearing is amongst the best of the mammals.
- Also have an acute sense of smell. About twice that of humans.
- Don't usually greet each other nose to nose, since it puts both participants in a vulnerable position. Cats who know each other well and have been apart for a while feel safe enough to do this, and gather information about how the other cat is, where he has been, and what he has been doing.
- Blink and narrow their eyes when they accidentally make eye contact. To make friends with an unfamiliar cat, blink and look away when you catch his eyes.
- Purring usually indicates contentment, but can also indicate pain. Cats start to purr at one week old, and young cats purr in a monotone while older cats can purr in two to three resonant notes.
Source: Readers's Digest.