Specifications include, but are not limited to: The Pennsylvania Game Commission is collecting bids for fifty (50) Iridium adult GPS radio-collars, 50 vaginal implant transmitters, and 50 expandable neonate collars to be used on Rocky mountain elk (Cervus canadensis). Each Adult GPS Radio-Collar must: • Be designed for use on free-ranging rocky mountain elk, and upon request, be supported with examples of their use on current elk studies. • Use GPS technology to collect accurate locations and transmit location data on a predetermined schedule using an Iridium satellite connection. • Store internally all location, activity, and temperature data collected during at least 2 years of continuous use. • Have two-way communication via Iridium for changing GPS schedules. • Have a battery life of approximately 2 years with 1 GPS fix every 13 hours, 1 GPS fix per Iridium message (e.g., once per day), and a VHF beacon on for 20 hours per day. • Contain a VHF beacon. • Contain a mortality sensor. • Contain a 3-axis activity sensor. • Contain a temperature sensor.