A radio-transmitter collar of surgical rubber tubing was designed for
use on growing juvenile mammals which require an expanding collar that
eventually is shed. In trials on three marsupial species, including s
ocial possums, collars were not chewed by conspecifics. Radio-collars
placed on wild juvenile Phascogale tapoatafa expanded with the animal'
s growth and broke as a result of abrasion, typically after 7 weeks or
more.