Two Humboldt penguins are weighed during a photocall at London Zoo on August 24 to promote the zoo's annual weighin event in London on August 24 2016...
{"Image ImageDescription": "Two Humboldt penguins are weighed during a photocall at London Zoo on August 24, 2016, to promote the zoo's annual weigh-in event in London on August 24, 2016. / AFP / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP via Getty Images)"}