My son's young corn snake has escaped. We've left out bottle traps and have floured the floor but no sign of him for 3 days. I'm concerned because our house is v old and large with lots of gaps into the walls and floors. And it's v cold at the moment, about 10C. We've kept the heating on in his open tank and this room is warmish too, but I'm pretty sure he's not here. Any suggestions or advice? Thanks.