Doves are known as the Mourning Dove because of their mournful cries and habit of mating for life. These soft gray birds can grow to be about a foot long and have adapted to live almost anywhere in the north Western hemisphere. Doves build nests from flimsy materials that often fall apart while nesting. Doves can be scared away from their eggs by the threat of predators. Building a dove platform birdhouse or nesting cone will attract doves to your yard and protect their eggs while they nest.