6 Answers

Before European colonization, Burrowing Owls probably inhabited every suitable area of the New World, but in North America they have experienced some restrictions in distribution since. In parts of South America they are expanding their range with deforestation.
They range from the southern portions of the western Canadian provinces through southern Mexico and western Central America. They are also found in Florida and many Caribbean islands. In South America, they are patchy in the northwest and through the Andes, but widely distributed from southern Brazil to Patagonia and Tierra del Fuego. Burrowing Owls are year-round residents in most of their range. Birds that breed in Canada and the northern USA usually migrate south to Mexico and southern USA during winter months.
This species is able to live for at least 9 years in the wild and over 10 years in captivity. They are often killed by vehicles when crossing roads, and have many natural enemies, including badgers, coyotes, and snakes. They are also killed by both feral and domesticated cats and dogs. Two birds studied in the Parque Nacional de La Macarena of Colombia were free of blood parasites.

Read more  >http://en.wikipedia.org/wiki/Burrowing_Owl

Did they have work visas for:  ?

Just a guess, they "flew" to Canada.   Don't they fly at all?

by flapping their wings

Migration

oh that's easy.

Migration!