London zoo is home to more than 8,000 animals, which all need counting for the annual stock take.
"From mammals to birds, reptiles, fish and even insects – all must be counted," the zoo said.
London Zoo carries out its annual animal stocktake, a process dating back two centuries. The stocktake sees the zoo officially record more than 8,000 animals on an international conservation database.
Colchester Zoo staff have completed their annual mission of counting all animals who live at the zoo.