I put those terro bait thingies down where the ants were clustering - on the kitchen counter near the toaster oven, next to the entry to the house by the door, and on the bathroom counter behind the sink (they were coming up through the drain, it looked like).
Someone told me the ants would go away by themselves eventually, usually within a week.
These little critters stuck around - in fact they really LOVED that terro. They lined up to coat themselves with it. Thousands and thousands of ants. My poor cat could barely eat because they would make a bee-line from the terro bait to the food dish and I wasn't home 24/7 to make sure the dish wasn't covered with them.
They eventually went away after a week.
The terro just attracted them. That's why it's called bait.
This year I think I'll go back to diatomaceous earth inside and outside.
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