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Researchers doing telemetry studies involving external transmitter attachments on young small mammals often employ expandable or breakaway collars. This method has been used for arctic ground squirrels (Spermophilus parryii plesius; Byrom and Krebs 1999), snowshoe hares (Lepus americanus; O’Donoghue and Bergman 1992, Gillis and Krebs 2000), chuditch (Dasyurus geoffroii; Soderquist and Serena 2000), and others to reduce the risk of mortality if a transmitter fails or if a leg or lower jaw becomes entangled in the collar (Soderquist 1993). Expandable collars also reduce the need to repeatedly capture and refit radio-collars on growing individuals, but they may increase the likelihood that jaws or appendages of juvenile lagomorphs will become caught. One alternative for attachment of radio |
