Foxy {L_WROTE}:
If a 'rat snake' sits up and hisses it's probably a cobra.
Cobras almost always hod when threatened, this is a defensive move on their part and if you move away they'll tend to do the same. It's rare but they can also spit venom so allowing them to continue to be threatened or toying them with sticks is a really bad idea (however many strikes in HK are attributed to this).
Rat snakes often look similar to the Chinese Cobra in colour and size and are more common. They don't hood or spit, they're not poisonous but they can be aggressive and bite.
I have spotted or stumbled upon many snakes in HK at this time of the year both on Lamma and more so in the Sai Kung (country park) area. I'm not sure but I believe this is due to the current weather pattern. Regular sightings are after a big rainfall, I guess they get washed down from the watersheds? Also early on sunny mornings whilst hiking/biking I have encountered snakes sun bathing, they're cold blooded after all. One encounter was a 9' King Cobra, he did not move away after I halted however I shortly did!
Bites do occur in HK. Not frequently but it happens. Generally the moving away trick works but the Bamboo Pit Viper (venomous but rarely fatal) and Burmese Python (not venomous but usually big) are known to ambush and some people/pets get attacked after surprising or antagonising them.
If you or anyone with you do get bitten then I'd say this:
1. Remove yourselves from the threat and record your location and the time of the bite.
2. Try to identify the species and call 999, give them as much information as possible about the colour, markings and size of the snake. A picture from a camera phone is a better idea than trying to capture the snake (as sometimes suggested), write down the details if you have pen and paper.
3. Stay as calm as possible
4. Try to keep the location of the bite as far below the heart as possible.
5. Wait for the emergency services to arrive.
That said, the risk is small (for humans) so don't let it spoil your enjoyment of the country side. Stamping your feet in tall grassy areas is usually enough to avoid an encounter, no point shouting I've yet to come across one with ears!
Here's some good info:
http://www.hkoutdoors.com/hk-wildlife/d ... -kong.html