These birds resemble turkeys. One species, the Spix’s Guan, has brown feathers speckled with white and red wattle. There’s also the Blue-throated Piping Guan, that’s mostly black with a gorgeous green shimmer. On moonlit nights, the Spix’s Guan is known to make frightening yelling noises. At dusk and dawn, the wings of the bird make a rattling sound, mainly to attract mates (Rainforest Expeditions).