Scientist free diving to make a photo identification of an individual manta ray (Manta birostris), Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

People on boat taking pictures ofBasking shark dorsal fin for photo-identification.(Cetorhinus maximus) Hebrides, Scotland (RR)

Minke whale (Balaenoptera acutorostrata). Damage to dorsal fins is often used for photo-identification purposes but even simply the shape of a 'clean' fin such as this may be identifiable. Hebrides, Scotland

The blueish colouration pattern of Blue whales (Balaenoptera musculus) is used for photo-identification. St. Lawrence estuary, Canada

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

DEU Germany : Flagpoles with flags of most the the states of the earth. United Nations Square Bonn. |

Police inspection, validating documents, passport, using UV light and a magnifying glass, mobile control station of the highway patrol, Muenster, North Rhine-Westphalia, Germany, Europe

Passport control area at an airport

Passport of the Federal Republic of Germany, guide book for Canada, various Canadian dollar banknotes

Passport of the Federal Republic of Germany and various Canadian dollar banknotes

International driving license, passport of the Federal Republic of Germany, guide book for Canada, various Canadian dollar banknotes

Ignition key, international driving license, passport of the Federal Republic of Germany, guide book for Canada and various Canadian dollar banknotes

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

Many spectators watching the visit of the Lufthansa Airbus A380-800, identification D-AIMA, Stuttgart Airport, Stuttgart, Baden-Wuerttemberg, Germany, Europe

Number plate Western Australia, Australia

Curious Holstein cows looking at the camera while standing in a fenced area with identification tags in their ears on a robotic dairy farm, North of Edmonton, Alberta, Canada

Holstein cow with her newborn calf in a pen on a robotic dairy farm, North of Edmonton, Alberta, Canada

Curious Holstein cows looking at the camera while standing in a fenced area with identification tags in their ears on a robotic dairy farm, North of Edmonton, Alberta, Canada

Two Holstein cows standing at a barb wire fence looking curiously at the camera with identification tags in their ears at a robotic dairy farm, North of Edmonton, Alberta, Canada

Close-up of the head of a Holstein cow standing at a barb wire fence making a funny face, with identification tags in it's ears on a robotic dairy farm, North of Edmonton, Alberta, Canada

Holstein cow looking out of a milking stall waiting to be milked using automated milking equipment on a robotic dairy farm, North of Edmonton, Alberta, Canada

Holstein cow looking out of a milking stall waiting to be milked using automated milking equipment on a robotic dairy farm, North of Edmonton, Alberta, Canada