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Table 1 Distances and trends of movements by Western Rattlesnakes radio-tracked from ten hibernacula in British Colombia (2010 and 2011). The movements of snakes originating at the same den were considered ‘Directional’ if all snakes tracked from the hibernaculum travelled trajectories within a 40° range of each other and ‘Random’ if the trajectories ranged over more the 40°. The ruggedness index was calculated for an area surrounding each hibernaculum using Relative Topographic position. Means are reported ±1 standard deviation, unless otherwise stated

From: Rattlesnake migrations and the implications of thermal landscapes

Region Code name, Hibernacula Number of study snakes Mean maximum straight-line distance (m) Movement directionality1 Destination habitat types (number of study snakes) Ruggedness Index1
Thompson-Nicola TN1 3 2165 ± 554.0 Directional Forest (3) 76.3
TN2 1 1478 n/a Open (1) 60.5
TN3 3 1908 ± 200.1 Directional Open (3) 38.1
TN4 4 2822 ± 1180.1 Directional Forest (4) 62.9
TN5 2 1293 ± 42.9 Random Open (2) 58.4
TN6 3 1854 ± 966.5 Random Forest (2); Open (1) 43.4
Okanagan-Similkameen OS1 4 1062 ± 574.1 Random Open (4) 74.8
OS2 3 738 ± 481.7 Random Forest (1); Open (2) 45.7
OS3 3 2420 ± 841.8 Random Forest (2); Open (1) 68.0
OS4 4 2143 ± 1018.1 Directional Forest (3); Open (1) 58.8