Pete Oxford / Female Jaguar (Panthera onca) under anesthetic, having teeth measured as part of the collection of biometric data and physiological samples for a relocation project, captive, Fundacion Santa Martha Ce...

Pete Oxford / Jaguar (Panthera onca) close-up of fur showing pattern of a female under anesthetic having biometric data and physiological samples taken for a relocation project, captive, Fundacion Santa Martha Cent...

Pete Oxford / Female Jaguar (Panthera onca) under anesthetic having foot measured as part of the collection of biometric data and physiological samples for a relocation project, captive, Fundacion Santa Martha Cent...

Pete Oxford / Veterinarian Alexandra Blanco with female Jaguar (Panthera onca) under anesthetic having biometric data and physiological samples taken for a relocation project, captive, Fundacion Santa Martha Centro...

Pete Oxford / Jaguar (Panthera onca) paw of a female under anesthetic for the collection of biometric data and physiological samples for a relocation project, captive, Fundacion Santa Martha Centro de Rescate, Ecua...

Suzi Eszterhas / Polar Bear (Ursus maritimus) researcher Nick Lunn holds three to four month old cub by the scruff while administering an anesthetic, vulnerable, Wapusk National Park, Manitoba, Canada