aggressive alert Australian beak bird black-and-white common gymnorhina-tibicen insectivore lookout maggie Magpie mottled nesting nesting-material plumage protective scavenging scrounging sharp sharp-eyed swoop swooping territorial watchful watching Australian-magpie boy bright-clothing brother caps children close competition curious enjoyment fearless friendly fun grass grassed-area headgear kids park picnic picnic-blanket relaxation relaxing seated shade shadows sister sitting sunlight sunshine visited visiting visitor wildlife Adaptation bill duck duckling ducks feathers geese and swans mallard pond swim water bird waterfowl wildflowl