We developed the BATS tracking system in an interdisciplinary DFG research unit. This innovative 'wireless biologging network' consists of animal-borne mobile nodes ('proximity sensors'), stationary download stations for remote and automated data access and can be extended by stationary versions of proximity sensors. Animal-borne proximity sensors document associations among indidual anmials and stationary proximity sensors may be installed at food resources or roosting sites to log individual visitation rates. 

left: bare proximity logger; final weight is 1-2g including housing and battery; runtimes vary between 1-3 weeks depending on battery size

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right: stationary proximity sensor for monitoring sites of interest.