Curtain rods ... happened when our first baby was born. It was the dead of winter in Minnesota (brutally cold), and I noticed that when I put the space heater on in her room, I started seeing a few black ants! I was horrified. Finally, after looking and looking, I traced them back to the curtain rod, where they had nested! They liked it when the room got warmer, and came out of their hiding place! We got rid of them without a problem. Here in California, we tried Terro for a long time and couldn't get rid of them entirely. Finally, we hired a service and never see any in the house. We've been ant free for about 3 years.