About 89 swallow species exist worldwide in the Family Hirundinidae. The only continent lacking swallows is Antarctica. Africa and South America have the greatest diversity of species. In North America, there are 9 regularly occurring species and 5 more occur accidentally. In Central Ontario, there are 6 breeding species of swallows – Purple Martin, Tree Swallow, Bank Swallow, Northern Rough-winged Swallow, Barn Swallow and Cliff Swallow.