Fig. 3
From: Automatic detection of small PIT-tagged animals using wildlife crossings
The individual trajectories of 12 tagged toads that completely crossed the tunnel. The x-axis shows the time (in minutes) from release; the y-axis shows the distance travelled (in metres) from the entrance. Black line = observed toad trajectories; circles = detection events (four detectors); horizontal dotted line = detector’ position in metres from the entrance