Hi Mark:

I’m no butterfly expert; but butterfly valleys – where can get migratory butterflies in late autumn – should be best around November/December.

If weather remains warm, can be good for fairly wide species variety, tho perhaps late in year for max nos (but if chill spell, seems that goodbye to various species).

Fung Yuen, say, is a top spot to visit.

Can be snakes, tho our dangerous ones mostly nocturnal; few animals. Not big issue, really.

Range of accommodation in Hong Kong; even if in Kowloon, not far from wildlife sites