7 quirky cat behaviors and what they mean

Nearly 100 million cats are kept as pets in the US.

My temperamental calico cat, "Harlem," is one of them.

And while she's the only one I have, she embodies many of the most common, and most perplexing, cat stereotypes.

So why does she - and the millions of cats like her - act that way?

Here are some explanations, backed up by cat researchers, for why our feline friends behave the way they do.