Shorebirds at lake Victoria, Point Lonsdale (Vic)

Hi frankandeng,

I know I should've said why Curlew Sandpiper, but sometimes I am a bit busy & or have trouble explaining why in words.

Anyhow, they are Curlew Sandpipers because of the bill lengh, size & shape, i.e. relatively, longish thin bill with a down-curve(like a Curlew). Also the white-rump.  No other regular wader in Australia with this combination. 

Note the odd bird in the bottom front middle has a dark line down the centre of the tail(edit - I should've said rump), ruling out Curlew Sandpiper, & the bill appears to be much shorter. So based on those facts & its size relative to the Curlew Sandpipers, it looks too big & dark on the upperparts for a Stint or Sanderling, leaving only Sharp-tailed Sandpiper is the likely choice for it.  Of course it's probably impossible to rule out Pectoral Sandpiper, but Sharpies are thousands of times more common in Australia.