That means it is easier for planes with only two engines to strike a flock of birds and lose power in both engines.

VOA: special.2009.04.01

Have you ever observed that birds of a feather flock together?

VOA: special.2010.06.13

One example is "Birds of a feather flock together."

VOA: special.2009.03.01

In Brazil,many people flock to Copacabana beach to ask the Afro-Brazilian goddess of the sea, Iemanja,a wish in exchange for a gift.

VOA: standard.2010.01.01