Juergen Freund / Boat at surface tracking Nautilus movements with a mobile receiver, off Queensland, Australia, 2007

Doug Gimesy / Field volunteer Grant Purcell shows how to place a weighted radio receiver into a river to help track the movement of platypus (Ornithorhynchus anatinus) which have had transponders attached. Mitta Mi...

Magnus Lundgren / Wild Wonders of China / Transpond reader (receiver) used to find the juvenile Chinese horseshoe crabs (Tachypleus tridentatus) before the release. Ha Pak Nai, Yuen Long District, Hong Kong, China.

Sebastian Kennerknecht / Mountain Lion (Puma concolor) biologist, Paul Houghtaling, and pilot Mark Dedon, tracking mountain lions from airplane using telemetry, Santa Cruz Puma Project, Santa Cruz Mountains, California

Solvin Zankl / Dr Ingrid Wiesel of the Brown Hyena Research Project holding radio receiver, Sperrgebiet National Park, Namibia, November.

Solvin Zankl / Dr Ingrid Wiesel of the Brown Hyena Research Project holding radio receiver, Sperrgebiet National Park, Namibia, November.

Solvin Zankl / Radio receiver tuned to receive signal from a Brown hyena (Hyaena brunnea) collared by the Brown Hyena Research Project , Sperrgebiet National Park, Namibia, November.

Bryan and Cherry Alexander / Scientists set up a GPS receiver to collect data as part of the WAGN (West Antarctic GPS Network) Project, which measures movement of land & ice. Patriot Hills. Antarctica, January 2006.

Inaki Relanzon / A researcher using a radio receiver to find Madagascar Pochard (Aythya innotata). Bemanevika protected area, north Madagascar, Africa, October 2010.

Pete Oxford / Leather pelts drying at the traditional leather tanneries, Fes, Morocco, June 2009

Juergen Freund / Receiver records pings of reef sharks with implanted transponders, Great Barrier Reef

Doug Gimesy / Regent honeyeater captive release project officer, uses a wildlife tracking receiver to find and determine the location of some captive bred Regent honeyeaters (Anthochaera phrygia) that have just bee...