Our one - hour class would have us doing freestyle, back stroke, breast stroke and eventually, the butterfly stroke. (thebigmansworld.com)
When Lee was in the fourth grade, he was already beating New York high school champions in his specialty, the butterfly stroke. (si.com)
Instead, other parts of its anatomy indicate Archaeopteryx may have thrown its wings upward and forward, similar to a swimmer's butterfly stroke, Voeten says. (sciencenews.org)