21.   Birds mostly sing in the spring to establish nesting territories, but mockingbirds sing in the fall, too.

22.   Birds were singing and calling.

23.   According to a legend invoked by the novelist Colleen McCullough, a thorn bird does not sing until it impales itself on the sharpest spine of a thorn tree.

24.   But birds sing.

25.   By noon, the skies had cleared, the birds were singing and it felt like a brisk October day.

26.   For most of it, the sun shone, the birds sang, and the airwaves were full of Buddy.

27.   Golly, the birds are singing sweetly.

28.   He does this as easily as birds sing.

29.   It was a scam to make birds sing.

30.   Mostly, they hang the cages from trees, where the birds sing in the fresh air.