Humane ant trap Terracotta is known for his property that it retains heat very well, so if you place the pot above an ant house there is a big chance they will transfer their nest into the pot. Ants are looking for the warmest place to hatch their nest. The trap also functions as a place where birds can eat and drink during the transfer of the nest. You can check a few times if the nest is replaced inside the pot, if that is de case you can turn the pot 180 degrees and put the ring of water over the trap. Ants will not pass the water so they are trapped and could serve as food for the birds.