Size comparision curlew and bar-tailed godwit(out of focus in front)
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How the heck does that work!! If the godwit is in the foreground, it must be absolutely minute in comparison to the Curlew...but that is not the case. Godwits are quite large, not that significantly smaller than Curlew. I think you have discovered a new race of bar-tailed godwit, 'minuta'.
Either that or you have coincidentally captured a Godwit at the very shortest body length and Curlew at the very longest.
My Flickr photos...
Have now added the whole original image and there is hint of redshank or possibly turnstone in foreground, completely out of focus. They also look rather small compared to the curlew
That makes it a bit easier to understand. However, that must be a beast of a curlew! Interesting picture, the size difference is really striking.
Suspect it was a very large curlew and small godwit, there may also be some optical illusion effects here too given the dark and light parts of image. Also use of a long lens, you expect further away things to be smaller but with the long lens there is not as much of this effect as the brain is expecting so further away things appear bigger. Unfortunately this was the only shot I got of the curlew
Lat/Lng: 52.974736111111, 0.60663194444444
OS grid ref: TF751451