Solvin Zankl / [captive] Green toads (Bufo viridis) on scale, Lake Coghinas ( Lago di Coghinas) is an artificial lake, in northern Sardinia, Italy

Nick Upton / Common / Hazel dormouse (Muscardinus avellanarius) being weighed in a plastic pot on a mini balance during a survey by Backwell Enviroment Trust in coppiced woodland near Bristol, Somerset, UK, Octobe...

Konrad Wothe / Newborn kitten being weighed on scales

Cheryl-Samantha Owen / African penguin (Spheniscus demersus) egg being weighed, part of Chick Bolstering Project, Southern African Foundation for the Conservation of Coastal Birds (SANCCOB), South Africa May 2012

Cyril Ruoso / Western Lowland Gorilla (Gorilla gorilla gorilla) five year old orphan being weighed, part of reintroduction project by Aspinall Foundation, Bateke Plateau National Park, Gabon

Terry Whittaker / 2020VISION / Myotis bat probably a Daubenton's bat (Myotis daubentoni) being weighed by researcher near Faversham, Kent, UK, September 2010

Terry Whittaker / 2020VISION / Myotis bat probably a Daubenton's bat (Myotis daubentoni) being weighed inside a stocking, by researchers, Kent, UK, September 2010

Suzi Eszterhas / Hoffmann's Two-toed Sloth (Choloepus hoffmanni)orphan baby being weighed, Aviarios Sloth Sanctuary, Costa Rica

Sebastian Kennerknecht / Cassin's Auklet (Ptychoramphus aleuticus) researchers, Jennifer Aragon, Michael Johns, and Ilana Nimz, weighing chicks taken from artifical nesting burrows near research station, South Farallon Island...

ZSSD / Jaguar (Panthera onca) cub being weighed, native to Central and South America

Stephen Belcher / Northern Royal Albatross (Diomedea sanfordi) chick being weighed by researchers, Taiaroa Head, Otago, New Zealand

Mark Hamblin / 2020VISION / Research scientist weighing Hen harrier chick (Circus cyaneus) Glen Tanar Estate, Grampian, Scotland, UK, June 2011