Radio telemetry is the major wildlife research technique to emerge from the 1970's. The principles had been explored and developed by 1965 (Cochran and Lord 1963, Cochran et al. 1965), but it was not until CMOS logic capabilities and integrated circuits reduced the size and cost of equipment a decade later that the technology was within the practical reach of most researchers (Macdonald and Amlaner 1979). Initial studies focused on the type of data most readily collected - movement and home range size information. Either explicitly with mortality-sensing devices or accidentally through loss of collared animals, many studies also determined patterns of mortality.
Page, R.E.. 1982. Technological Concerns in the Use of Radio Telemetry for Animal Habitat Identification. Ministry of Forests. Wildlife Habitat Research Report. WHR2