wgeoff

I suspect this is the Mountain (Brownish-flanked) Bush Warbler which has been on Po Toi all winter. It makes a ticking noise like a geiger counter, not as loud as a Dusky Warbler. It stays in the thick upper canopy of tangled branches and is very difficult to see, almost impossible to photograph.

Did you see it just above the upper school? This is where it normally is.