Barbuda's Frigate Bird Sanctuary is located in the island's northwestern lagoon and is accessible only by boat. The sanctuary contains over 170 species of birds and is home to over 200,000 frigate birds. Fregatamagnificens, the most aerial of water birds, possess the largest wingspan (four to five feet) in proportion to the body size of any bird in the world. It is also known as the man o' war bird, and the comparison to warships is a particularly apt one with its superior size and flight capabilities, the frigate bird harasses less agile flyers like pelicans, egrets, and cormorants until they drop their catch. The male frigate is marked by its red throat pouch, which it can inflate as part of its courtship behaviour and as a defensive display. Courting takes place in the fall, and chicks hatch late in the year.