For these penguins in Singapore's city zoo, lockdown is flippin' fun

As well as roaming the empty walkways of the zoo, the penguins have also been tackling an obstacle course which has been specially designed to keep them entertained. (Handout photo released by Wildlife Reserves Singapore)

Penguins here are given the run of the empty complex and revelling in the chance to do some exploring. (Handout photo released by Wildlife Reserves Singapore)

So their keepers began taking them on outings around the complex, nudging the pint-sized explorers to check out the area around their exhibit and the children's playground. (Handout photo released by Wildlife Reserves Singapore)

The colony of around a dozen birds appeared unimpressed by the climbing-frame and the slide, and soon waddled off to the next section. (Handout photo released by Wildlife Reserves Singapore)

Several life-sized models of sea lions -- which occasionally eat penguins in the wild -- gave them pause for thought. But they soon regained their courage and were back to hopping over rocks. (Handout photo released by Wildlife Reserves Singapore)