Where do swallows sleep? - Kylon Powell
Rachel Davis 
Swallows sleep on a tree branch, a rock ledge of a cliff face, or inside the hollow of a tree
Swallows are small birds that live in habitats all across the world. Swallows are named for their characteristic swooping flight pattern. These migratory birds can travel thousands of miles each year but always return to the same location for breeding. While swallows in urban areas of Europe and North America, such as Canada Geese and European Starlings, have learned to adapt to living among humans, most species of swallows nest in burrows dug into the ground.
Each swallow needs to find a place to make its nest. To build these nests, swallows may visit hundreds of sites and use mud collected from the bottom of lakes and rivers. Some species may even gather materials from the dew that is found on leaves. This might sound like a lot of work, but building nests is very important to swallows. Swallows build their nests to lay eggs and raise young ones, so it is extremely important for them to make sure that their nests don’t fall apart during storms. Eagles and other birds of prey are always on the lookout for opportunities for quick meals, so parents must stay alert in order to keep their young ones under protection.
Do swallows mate for life?
Yes, they do, with one exception. The Barn Swallow mates for life if the male and female are together since hatching. However, barn swallow pairs often leave the nesting site during winter and separate until the following spring. If a separated pair meets again in the next breeding season, they will mate again, often in the exact spot where they separated.
Do swallows return to old nests?
The same birds may return to breed year after year, but there is no way of proving it, just as we cannot identify swallows by the markings on their feathers. Their nests, like the birds themselves, are transient.
