Frigatebirds, are named after the warship, Frigate; they are also called man of war birds or pirate birds because they like to steal prey from other seabirds.
The most notable feature of the frigatebird is the male’s inflatable red gula pouch on his neck and chest. He blows it up big to attract the attention of females. The birds have black feathers with the female having a white belly.
Click here to check out a video of that pouch.