Magpie-Lark, Perth WA. Hungry fledgling begging for food.
These guys have a few different names. Magpie-lark is the most widely accepted (though they're neither magpies nor larks), growing up I've always known them as Mudlarks. Another name I quite enjoy is Peewits or Peewees. I also just have to share this excerpt from wikipedia on the nature of the duets that males and females sing with eachother, because it's pretty fascinating stuff!
"In the case of the magpie-lark, the duet singing is now known to be cooperative: pairs sing together to defend their territory. Magpie-larks sing more vigorously in response to duet calls from other birds than they do to the call of a single rival, and more vigorously still if the callers are strangers rather than established and familiar birds from a neighbouring territory. A pair of neighbours calling from the "wrong" place, however, (as when calls are recorded and played back by an experimenter) bring forth a powerful reaction: clearly, they know exactly who their neighbours are.Magpie-larks also engage in pseudo-duets when nesting. In this, one individual mimicks the contribution of a missing partner, sustaining the impression to other birds that two are present."
