tsheunglai

Dear Akhan

It's an adult Crested serpent eagle. It is a local eagle which frequents forested areas. It usually
makes repeated four-note calls while soaring in the sky. It is a whistle resembling 'fuf-fuf, vua-vua' in standard English pronuciation, short, low and flat pitched for the first two and in rising tone for the last two which are light and clear.

Last words,nice photos.

S L Tai

tsheunglai

Dear Akhan

Note I've added a Cantonese equivalent, as a further attempt to fix the real sounds  of CSE's call.

S L Tai