The nafs of the bird is still milder; therefore upon one tree many and various kinds can live as one family, singing the praise of God in unison, and flying about in flocks of thousands. Among birds are to be found those who recognize their mate and who live together harmoniously, building the nest for their young, each in turn sitting on the eggs and bearing their part in the upbringing of their little ones. Many times they mourn and lament over the death of their mate.