From Ian Cruickshank:
"This morning at Rocky Point I had a flyover small passerine giving
flight calls I didn't recognize - a single very high, completely
clear "tseeew" with no buzzy quality, fairly long, and slightly descending/thinning gradually at the end. I immediately thought it may
be a wagtail sp. based on the calls, and though I remembered
that Red-throated Pipit calls were distinctive, I've never heard one and
couldn't remember the specifics. Well, I just listened to flight calls
of all the east Asian wagtails and pipits, and none of them fit,
except Red-throated: a perfect match. It was heading south across the
strait on its own, and while I heard the flight call several times, I
only got a visual on it once it was a little speck against the
sky heading away from me.
The size/structure/flight style of this speck did look consistent with a pipit..."