Neil Aldridge / Portrait of an African wild dog (Lycaon pictus) wearing a radio collar in dense mopane bushveld, Venetia Limpopo Nature Reserve, Limpopo Province, South Africa, February 2010.

Andy Rouse / Osprey (Pandion haliaetus) young male 'Einion' in flight. The bird is wearing a radio tracker. Dyfi Estuary, Wales, August. It is the first time ospreys have bred at this location for 400 years.

Mark Hamblin / 2020VISION / Research scientists fitting satellite transmitter to Hen harrier chick (Circus cyaneus) for tracking movements after fledging. Glen Tanar Estate, Grampian, Scotland, UK, June 2011. Winner, documentary...

Nick Upton / 2020VISION / RSPB volunteers Jane Munstermann and Derek Stevenson observing and radio-tracking Common / Eurasian cranes (Grus grus) released by the Great Crane Project onto the Somerset Levels and moors, on a fogg...

Juergen Freund / Chambered nautilus (Nautilus pompilius) with radio transmitter, Indo-pacific

Juergen Freund / Richard Fitzpatrick releases Grey reef shark {Carcharhinus amblyrhynchos} after inserting transmitter into its belly, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Richard Du Toit / Two Lionesses fitted with radio tracking collars {Panthera leo} Chobe NP, Botswana

Claudio Contreras / California condor (Gymnogyps californianus) in flight, wings radio tagged. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico. 2011.

Claudio Contreras / California condor (Gymnogyps californianus) in flight, wings radio tagged. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico. 2011.

Claudio Contreras / California condor (Gymnogyps californianus) in flight, wings radio tagged. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico. 2011.

Claudio Contreras / California Condor (Gymnogyps californianus) standing on rock, radio tagged. California condor recovery program, Sierra de Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico. 2...

Claudio Contreras / California Condor (Gymnogyps californianus) standing on rock, radio tagged. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico.