● Castolon [Loc 41] Big Bend N.P., TX USA [el. 660 m / 2164 ft] view location in Google Maps » ● 3/06/10 10:47AM sun/haze, air temp: 19°C / 66°F As mentioned earlier, these Pogonomyrmex desertorum workers were exhibiting a defensive posture in response to P. rugosus workers in the area [see first 3 images in this gallery]. This one didn't bother to first drop the object she was carrying, before 'assuming the position' (she remained like this for over 5 minutes). [scroll down for additional notes/references] ADDITIONAL NOTES/REFERENCES: The integument (outer body covering) of these P. desertorum workers was quite translucent. When back-lit by the sun (as can be seen in some of these images), these ants glowed with the most beautiful orange-red color. In some cases, x-ray-like hints of their internal anatomy could be seen as well. - Pogolumina - Pogonomyrmex Harvester Ants of North America