Short-billed or Long-billed Dowitcher, Help with IDs --Taiwan , East Asia (1 Viewer)

[Wayne Chang]

These were taken this February in Taiwan, East Asia.
In Taiwan, Only 1-2 Long-billed would pass Taiwan, Short-billed not any documented.

But this Dowitcher bill slightly shorter different from Long-billed typical.
In addition based on the live recording shows this sound "tu-tu-tu" (3s' and 5s' ；Please have a look at the attached link), suspected it is Short-billed.

Please help me to identify who was it？(All photos and sound recording are of the same bird individual)
Thanks!

Wayne

Listen to the call : ML542851351 Tringa sp. Macaulay Library
ML542851351 Tringa sp. Macaulay Library

 

[Indobirder]

Too hard for me, but are the underwing-coverts white? If they are, that would make it a Long-billed I think

 

[Wayne Chang]

Too hard for me, but are the underwing-coverts white? If they are, that would make it a Long-billed I think

Limited by the pixel limit of the photo, that appear blurry ....

 

[smiths]

The bill shape, pattern and colour of the upperparts, and, especially, the pattern of the underwing (lesser coverts + axillaries) clearly indicate that this is a Long-billed Dowitcher. See this excellent article: Underwing pattern in dowitchers — subalpinebirding