|Photo Source: The Telegraph|
We didn't have this many ants, which was bad for the experiment but good for our backyard. The original text with this photo said they found the ants preferred yellow and green. Ours seemed to go for the red, but really they tended to just go for whichever color they came upon first. We watched for a long time to be sure.
Also, I didn't think the little solid black ants in our yard would look like those in this photo. However, after they drank for awhile, they did get big ol' bellies that went transparent like in the photo above, and you could easily see the different colors in them depending upon which drop they were drinking from!
While I'm not normally crazy about ants, the little guy and I had a lot of fun with this experiment, and he talked about it a lot.