These are female Crotalus horridus on a gestation site in the Blue Ridge region of North Georgia. They were photographed over a two day period between the hours of 9am and 7pm. A dim, bluish color marks the morning and the second day of photographing, and the snakes are absent in frame for a brief period. Take note of how they all seemingly pour out from under their shelter stone at once in an effort to recharge in a wash of sunlight after spending a cool night against cold damp earth and rock. It is also worth noticing just how much they adjust themselves. These pictures were taken at 30 second intervals.
Pretty cool yawn at around 2:34.