I love watching these birds. Woodsier than pigeons they spend more time on the ground than in the air. They waddle around and are always in pairs. I thought they were Morning Doves until I looked it up. They are probably called Mourning Doves because their coo sounds like a lament.
A pair of them are building a nest in the cherry tree out front and we have a closeup view of the action. The male, the more colorful and bigger one, shown on the left in my photo, dutifully collects small sticks and leaves and brings them back to the nest, putting each piece in the mouth of his mate. She packs it under her body while she sitting on the nest and he flys off for another piece. They can live to be thirty years old.