Why putting the kids to bed can be a challenge, reason #21

Among the questions Will asked me tonight, which included:

“Why do people have different types of blood?” and
“Why do some people eat other people?” and
“Why do people get gas in their belly?”

was,

“Do cats swim?”

Of all of them, that last one was the one that stumped me the most; I really wasn’t sure. Thank goodness for YouTube!