ocr: UNUSUAL CALLS A partial migrant, the Eurasian bittern hides among reed beds, where the male's booming call can be heard ar night throughout the breeding season. The powerful, deep notes sound rather like someone blowing into an empty bottle. BLUE BIRD OF PARADISE e LAUGHING LITTLE KOOKABURRA WATTLEBIRD EURASIAN EURASIAN CUCKOO NIGHTJAR EURASIAN e MONTEZUMA'S BITTERN OROPENDOLA % e 880 - 8090 - d 80 - > 380 6 88 e - - e 8 6 0 - - a à - 0e X - e
