The full citation for the Bogertophis study is:



Sawyer MW. Baccus JT. MOVEMENT ECOLOGY AND THERMAL BIOLOGY OF BOGERTOPHIS SUBOCULARIS FROM TEXAS (SERPENTES, COLUBRIDAE). [Article] Southwestern Naturalist. 41(2):182-186, 1996 Jun



Quoting from the paper:



"Eight B. subocularis, six males and two females, collected at disparate locations on roads in Terrell and Val Verde Counties, Texas, were...released at the same site (albeit foreign to the snakes).... The original design of the study was to release each snake at the point of capture, however, as collection began, the endangered species act became a major political issue in this area of Texas. As a result, only one rancher agreed to participate in the study. ...Because of predation, movement off the study area, unexplained death, and presumed transmitter failure [=removed by herper?], only three of the eight snakes (1,3,and 8) were tracked for more than 10 days. Owl feathers were found in the immediate area of two skeletal remains near transmitters.

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