Will Burrard-Lucas / Black and white image of people fitting radio tracking collar onto African elephant (Loxodonta africana) Tsavo Conservation Area, Kenya. Editorial use only.

Will Burrard-Lucas / Black and white image of people viewed through sedated African elephant (Loxodonta africana) tusks during radio collaring operation. Tsavo Conservation Area, Kenya. Editorial use only.

David Perpinan / Vaccination of a male Brown bear (Ursus arctos) anaesthetised in Slovenia for a reintroduction project in the Pyrenees, Jelen Reserve, Slovenia, June, 2016.

David Perpinan / Dental examination of a male Brown bear (Ursus arctos) anaesthetised in Slovenia for a reintroduction project in the Pyrenees, Jelen Reserve, Slovenia, June, 2016.

David Perpinan / Vets attaching an ear transmitter to a male Brown bear (Ursus arctos) anaesthetised in Slovenia for a reintroduction project in the Pyrenees, Jelen Reserve, Slovenia, June, 2016.

Jen Guyton / Scientists monitor the vital signs of sedated African elephant (Loxodonta africana) while they take hair and faecal samples and fit it with a GPS collar. Gorongosa National Park, Mozambique

Laurent Geslin / Scientists with anaesthetized Eurasian lynx (Lynx lynx) caught as part of translocation and reintroduction project, Switzerland, March.

Laurent Geslin / Scientists from KORA examining sedated wild Eurasian lynx (Lynx lynx) at night, captured to translocate to Austria. Switzerland, March.

SCOTLAND: The Big Picture / Vet from The Royal Zoological Society Scotland / RZSS taking a blood sample from a sedated Scottish wildcat (Felis silvestris grampia) male. Inside RZSS mobile vet unit, Strathsprey, Cairngorms Nation...

SCOTLAND: The Big Picture / Scottish wildcat (Felis silvestris grampia) male, sedated and on side for pelage scoring. Inside The Royal Zoological Society Scotland / RZSS mobile vet unit, Strathsprey, Cairngorms National Park, Sc...

SCOTLAND: The Big Picture / Scottish wildcat (Felis silvestris grampia) male, on back to show underside for pelage scoring. Inside The Royal Zoological Society Scotland / RZSS mobile vet unit, Strathsprey, Cairngorms National Pa...

SCOTLAND: The Big Picture / Scottish wildcat (Felis silvestris grampia) male, on back to show underside of chin for pelage scoring. Inside The Royal Zoological Society Scotland / RZSS mobile vet unit, Strathsprey, Cairngorms Na...