Your cat may approach you with its tail straight up and quivering at the top ... because a purr or a rub against you can mean the same thing. One of the things about cats is they like to decide ...

Unfortunately, humans don't have tails like cats. So, an online merchandise store, ThinkGeek, created the Twitchy Kitty Electronic Tail. Just having a tail might not be enough for some.

Generally speaking, a cat will stick their tail high up in the air when they're happy and confident. If that flagpole tail is quivering, it's likely a sign that they're super happy to see you.