dance synchrony of red-crowned cranes

asia attraction avian bare behavior bird birds black chilly clouds cold court courting courtship crane cranes crowned dance display ecotourism endangered exhibition freezing frozen grus harmony instinct japan japanese japonensis longevity luck mating nature ostentatious pair parallel pursuit red romance season seasonal seduce seduction sky snow solicitation spectacle suitor symbol synchronous synchrony threatened travel tree trees vulnerable white wild wildlife wing wings wingspread winter