1. Swallows usually choose dense Woods, forests or woodlands as their habitats. And what kind of tree do you like, because the species and regions of swallows are different.

2. Common swallows inhabit trees including large deciduous trees (such as oak, poplar, willow and elm), coniferous trees (such as pine, spruce and cypress) and fruit trees (such as apple trees and cherry trees).

3. Different types of swallows will choose different trees. For example, brown swallows like to nest under the eaves of woodland or urban buildings, while rock swallows like to nest in cliffs or rock crevices.