The Frill-necked Monarch measures around 14 cm (5.5 in) in length, and the neck feathers can become erect into a small frill; the male is predominantly black and white, and can be distinguished from the similar and more common Pied Monarch by its all-white breast-the latter species having a broad black breast band.
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Neck frill, the relatively extensive margin seen on the back of the heads of some reptiles
Similar to the portrayal of the dinosaur Dilophosaurus in Steven Spielberg's Jurassic Park, the frill-necked lizard can puff out these neck frills either side of its head when threatened.