3 adjectives to describe cooings

The air was so still that she heard the distant wood-pigeons cooing; and round about her the bees were murmuring busily among the clustering heath.

The hum of insects, and sudden disturbance of rich-coloured parrots, screaming and fluttering through the branches, and the strong, short, rapid flight of the dove, with its melancholy cooing, transported us in imagination a long way inland, whereas we were not three hundred yards from the beach.

The loud croaking of the Log-cock, the cackling screams of the Redheaded Woodpecker, and the solemn, tolling note of the Redbreast, blended with the occasional cooing of Turtle-doves, formed a sylvan charm, that made my winter-rambles, at this period, as interesting as any I ever pursued in summer or autumn.

3 adjectives to describe  cooings