Specifications include, but are not limited to: GPS radiocollar capable of collecting a minimum of 6 locations per day with battery life lasting ≥ 36 months with a built-in mortality sensor and optional drop-off mechanism. Other features of radio collars should include a virtual fence or geo-fencing feature allowing user to program a geo-referenced boundary that will modify GPS fix schedule based on animal’s proximity to boundary. Data will be available real-time via Iridium network and accessible via web-based data portal. GENERAL DESCRIPTION GPS fix schedule Minimum of 6 locations per day GPS Satellite system 2 -way Iridium communication VHF schedule Ability to program from sunset to sundown automatically based on geolocation VHF frequency band width 216.000 – 220.000 or 225.000. Use of embedded coding on single frequency for multiple animals may be considered. Mortality mode and sensor setting Adjustable mortality period of 1-24 hours after no activity, collar will switch to mortality mode and email or text message sent to user Overall battery life ≥ 36 months under average conditions Programming options Duty cycles programmed before shipment but allow user to modify GPS schedule and VHF schedule prior to or post deployment Software and Internet Portal for viewing and accessing GPS and sensor data Allow all or part of the GPS fix history of a collar to be viewed over Google Earth satellite imagery either in a stand-alone web interface or by downloading a KML file from a data portal. Data portal would also provide access to GPS and sensor data viewable in spreadsheet form Weight Under 500 grams including drop-off mechanism Virtual Fence or Geo Fence Virtual or Geo fence boundary that would modify GPS schedule based on proximity to “virtual fence” boundary. Solar Power Capable Ability to use both solar and internal battery for extended life of collar.