Ok I have learned two things today.
1)get rid of rats, they eat your crops and attract snakes
2)wear boots. Even in midsummer.
I just quickly dashed out to get a spring onion or three for the potato salad, and to grill with the ribs I was cooking. Barefoot, because I was in the kitchen. The pregnant part has a few problems, but I damn near had a conniption on the spot when I had a tiger snake slither past my heel, brushing against it (I had stepped over the snake, I assume). I thought it was a dog's nose and sort of kicked back because they're not allowed in the onion garden. It slithered off my heel and I realized that was no dog nose, and found myself some distance away by levitation, saying perhaps slightly unladylike things. I'm allowed to.
I returned with a spade... to dig up the rat hole. Yes really I was only intent on removing the rats. I have a hole the size of Kimberly in the back yard. No snake.