The paragraph describes a periodic behavior shown by a frigatebird. The male frigatebird has a red-colored sac on its neck that it can slowly inflate. The bird takes around 20 minutes to change the sac into a red, heart-shaped balloon. After inflating the sac, the bird shakes its head from side to side and shakes its wings. How does this behavior help the bird? It helps the bird attract mates. It helps the bird attract mates. It helps the bird swim in water. It helps the bird swim in water. It helps the bird warn prey. It helps the bird warn prey. It helps the bird stay warm in winters. It helps the bird stay warm in winters.
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