OP...............Cobras are deadly, but they are not as aggressive as what many people believe. In fact, a cobra will quite often not even bite when it strikes, but of course it's best not to take chance. We have had a few visit us here at our place and basically, the minute they see you they try to escape. Unless you know what you're doing, I would advise you to let them go on their way. To kill one you have to get quite close, and depending on its size, you could well be within its reach. If you happen to stumble across one, simply stand still or back away. It will NOT chase you - ever! That only happens in the movies I'm afraid.
As a side note, there are other snakes, apart from cobras, that also flatten their necks in order to scare you off. When we first moved into the house, we found what we thought was a cobra, but when some workers took a look at it, they said, "not same cobra", grabbed it by the tale, and yes you guessed it, it became their supper.
Pit Vipers................well, we've unfortunately had several of them around, but unlike with the cobras, I don't see them on their way. I have two small kids to think about, and the Pit Vipers don't seem that willing to bugger off when you get close. I nearly stood on one the one night just as I was getting onto my bike, but fortunately it didn't strike. This also makes me wonder if they really are as keen to strike as what some people say they are. Each time I have come across one after that first time, it's been because my Rottie has alerted me, and I have then gone ahead and killed them. Normally, I don't mind snakes but Pit Vipers are bad news, and even more of a worry when you've got young kids running about.
Oh yes, I have just remembered another encounter with a cobra. It happened when I was down the road cutting food for my goat. While busy, I noticed a huge one about 3 to 4 meters away from where I was standing. Obviously it was also aware of me being there because it just stayed perfectly still. I simply carried on with what I was doing and the snake continued on it's way, so there you have it, cobras will not start chasing you.
You'll also encounter rat snakes from time to time. These can get quite big and as a result, they can look quite scary. However, they will ensure you don't have any rats moving in, and as far as I know, they also keep the toad population down.
I have also found two pythons here, but they were just babies. I just let them be, so I have no idea whatever became of them because I've never come across any pythons since then. If you do come across any of these, please don't kill them because if they grow big enough, they can hopefully eat one or two of those pesky soi dogs that keep running in front of my bike.
I think a lot also depends on your property. If you don't have much land then there's not really enough space for each and all to go about their lives without disturbing each other. We have half a rai, the house only takes up about 130 square meters, so there's plenty of space to go around for all to share. I even have bats under the house, and I've had a huge job trying to convince my other half that they are not bad luck, but instead, they're good luck because they eat tons of mossies and etc.
If you really must get rid of a snake, and you don't want to kill it, or you don't want to get that close in the first place, you can make a very effective snake catcher for under 100 baht using some PVC pipe and some cord. Just Google it if interested.
Above all, enjoy your stay, and tell your wife those creepy crawly worm-like things one comes across from time to time are worse that the average snake you'll see. I don't remember the Thai name for them, but to you and I, they're centipedes. They give a nasty bite, which will result in you going to hospital. On the other hand, give one to a few Thai kids and they'll have it "de-weaponized" in no time at all. They will then play with it until it eventually becomes boring, and at that point, it gets to meet its maker. Jokes aside, they are nasty critters, and you really don't want a bite from one.
