birds cranes flight fly Grus grus Hula Valley Israel migrating migration natural nature silhouette Australia Australian Australian-crane bird brolga crane dance dancing-bird dwindling-numbers feathered feathers graceful gray gregarious grey grus-rubicunda large long-legged long-necked loud-calls majestic native-companions Noisy plumage prance prancing red-headband reddish-crane slender tall trumpeting wader wading-bird water-bird wetlands-bird wildlife