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Waders in Costa Rica, October (1 Viewer)


Well-known member
Hi forum,

I went to Ostional Beach (Pacific side) in Costa Rica in mid October. Apart from the hundreds of vultures and caracaras feeding on turtle eggs there were a few waders - something which is not my strongest side.
There were many Sanderlings and Ruddy Turnstones and then some others.
My guess is that he plovers are semipalmated plovers (Charadrius semipalmatus) - is that so? Or could there be a Wilson's or something else in between? And then there are the ones with brown/grey stripes on the chest - I guess they are a type of sandpiper?

Picture 1-5 shows birds from a group near the waters edge, picture 6-7 shows some birds who were a little further up the beach.

Any comments on ID would be greatly appreciated?

Thanks, Peter


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Well-known member
two more pictures

...and here are picture 6 and 7


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Well-known member
United States
All plovers look like Semipalmated to me. In #6, the sandpiper in the middle looks quite like White-rumped. On the others, though, I'm back and forth between White-rumped, Baird's, and Pectoral Sandpiper.

I am assuming you already distinguished the Turnstones and Sanderlings in #s 2-5.


Well-known member
I'm seeing at least Baird's (photo 1) and pectoral (e.g. photo 4, bird above the turnstone and sanderling with the rufous cap and neat breast band). Also possible white - rumped (middle bird 6). Might have a more forensic go at them later
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