Abstract
Obtaining access to the end of a burrow is often required to collect the inhabitant, sample food caches, observe nests, or open inspection windows. Because animal burrows often wind around roots, rocks, and other underground obstructions, excavation of an entire burrow system is labrious, particularly if large obstructions are encountered. It is necessarily damaging to the environment. Furthermore, excavation can only give information about a burrow that no longer exists, and is therefore not an appropriate technique for behavioral or other ongoing studies. These problems hampered my study of burrowing land crabs (Gecarcinus lateralis) on Bermuda, and stimulated the development of a radio probe that could be used to determine the location of the terminal chambers of burrows and their orientation in the ground. Thus, crabs and soil samples could be collected by digging straight down from the surface rather than by digging along the entire length of burrows that threaded through stony soil.
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