Natalie, they are Bush Stone-curlews. The stone-curlews are large terrestrial waders. The group is cosmopolitan but occurs rarely in North America. Bush Stone-curlews are difficult to see on mainland Australia but, incongruously, are common and confiding on islands off shore. I feed the birds in the picture: they are, in order: parents - male female, behind them the babies - male and female. Every year these parents bring their hatchlings down for me to feed in September (they are precocious). Their calls are a series of spectacular screams. Good fun when you have people over for a first time visit: they nearly have a heart attack when the birds call from near their bedrooms. Here is another one asleep typically on its knees. Or was, until it half lifted an eyelid to monitor me.
Glen. 
