London Zoo is carrying out its annual “weigh-in”, during which zookeepers weigh thousands of animals at the site as part of routine health monitoring. Reports say the exercise involves penguins and capybaras as well as many other species, with animals brought to scales positioned within their habitats.

Outlets describe a large-scale operation designed to minimise stress and encourage animals to step onto the equipment. The Evening Standard says the scales are disguised in habitats, allowing animals to hop or move onto them. Another account reports the event features a wide range of animal types, covering mammals, birds, reptiles, fish and invertebrates.

While most coverage focuses on the breadth of the weigh-in—reported as more than 10,000 animals across thousands of species—some outlets highlight particular “standout” species visually, noting that fan favourites appear prominently in public-facing photos and video from the day. All accounts frame the weigh-in as a scheduled, health-related procedure rather than a one-off event.