african balearica-regulorum bird colorful coloring colors colourful colouring colours crane crown crowned endangered feathers feathery-crown gold-crown gray grey grey-crowned-crane long-legged majestic omnivore omnivorous plumage Ugandan-national-symbol vulnerable balearica-pavonina banded beak black black-crested-crane black-crowned-crane black-head-patch captive crest display displayed displaying distinctive forager golden-head-feathers gruidae gruiformes large long-necked spreading Sub-Saharan toes trained trees-roosting Ugandan-national-bird vertebrate white wildlife wings wingspan