1.   Hundreds of thousands of wading birds clouded the sky.

2.   Nearby, swarms of mating cockroaches cloud the sky, their dark wings whirring.

3.   The sky was clouded by misgivings.

4.   A pall of black smoke clouded the skies after oil refinery installations were hit overnight southwest of Grozny, near the village of Yermolovskaya.

5.   On Saturday, a pall of black smoke clouded the skies southwest of Grozny after oil refinery installations were hit.

6.   The fires burning in Mexico and Central America have clouded skies as far north as Texas.