armor armored armorment armour armoured armourment backstraps bony ridges crocodile crocodylus-porosus danger dangerous dorsal-surface estuarine-crocodile exotic fauna hide hornback huge Indo-Pacific-crocodile large largest-reptile leather leathery lethargic omnivorous opportunistic opportunistic-predator osteoderms patterns powerful predator reptile reptilian ridges rough rugged saltwater-crocodile scales scutes skin tail tail-scutes territorial texture textured textures Australian-magpie beak bird black-and-white boy bright-clothing brother caps children close common competition curious enjoyment fearless friendly fun grass grassed-area gymnorhina-tibicen headgear insectivore kids maggie Magpie park picnic picnic-blanket plumage relaxation relaxing scavenging scrounging seated shade shadows sharp sharp-eyed sister sitting sunlight sunshine visited visiting visitor watchful watching wildlife aerial aeroplane airplane Alice-Springs angles appearance arial below celestial-impact central-Australia crater distance distant expanse flying formations from-above geologically-significant Gosse-Bluff height high impact-crater isolated landscape looking-down massive mountainous movement moving Northern-Territory outback panoramic-views remote rural scenery scenic sightseeing sparse terrain Tnorala travel travelling undulating vegetation