Mangos are plentiful, lychees are imminent.
Interrupting the torpor: the Asian Koel, aka common koel:
This is a noisy species, with persistent and loud ku-OO ku-OO calls as well as other cackles and screams.So far unseen, but surely heard. Perhaps it perches in the higher reaches of one of the square's tall Chinese Banyan trees.
For more info: Wikipedia
Sound byte: Bird songs (wav files), Hong Kong Bird Watching Society