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All of these ants were found alive and well in the wild, showing that ants can adapt to physical deformities and still lead a fairly normal and active life
These "siamese twins" Acromyrmex (A. balzani) were captured while carrying leaf fragments back to their nest in a foraging column found in Rio Claro, São Paulo, Brazil. The ants were sent to Beto Brandão and are deposited in the MZSP. These ants share part of the petiole and the entire postpetiole and gaster.
This is a very strange anomaly and a really messed up ant from Miller County, Arkansas. This image was on the cover of the Journal of the Arkansas Academy of Science, Vol. 63, 2009.
While we're on the subject of developmental abnormalities, count the legs of this Pachycondyla. It has the normal 3 on the other side, but 4 on the side facing making it an ant with 7 legs in all.