No, they weren't short. They weren't huge either, so I can probably rule out killer whales.
Of course, by the time I got home, I wished they had been killer whales. I don't know why I ever spoke as a child. Nothing good ever came of it. I was swatted so hard I traveled in time to the following week. Imagine my disappointment when I found that my future self was still getting whacked for violating the laws of physics. Well, in addition to pointing out members of a local coven, that is.