Mark Carwardine / Black rhinoceros (Diceros bicornis) - darted and being prepared for translocation by rangers from the Kenya Wildlife Service, being measured Nairobi National Park, Kenya, Endangered / threatened spec...

Franco Banfi / North American crayfish (Orconectes limosus) next to tape measure to show size, Lake Lugano, Ticino, Switzerland, December.

Eric Dragesco / Snow Leopard (Panthera uncia) droppings / faeces with tape measure for scale, Altai Mountains, Mongolia

Eric Dragesco / Snow Leopard (Panthera uncia) footprint / pug mark in snow, with tape measure for scale, Altai Mountains, Mongolia,

Tim Laman / Young boy helps his mother (orangutan researcher Cheryl Knott) measure the diameter of an orangutan food tree (Artocarpus sp.) with a measuring tape. Borneo, July 2007. Model released

Staffan Widstrand / Researcher measures teeth on European Brown bear {Ursus arctos} Dalarna, Sweden.

Onne van der Wal / Boat-builder using a tape measure to mark out wooden boat parts with a pencil during construction of interior yacht parts.

Onne van der Wal / Plans and tape measure on deck of a boat under construction.

Andy Sands / Slime mould (Lamproderma scintillans) group of sporangia growing on edge of a Holly leaf shown for scale next to 1mm marks on tape measure, Buckinghamshire, England, UK, December - Focus stacked