Roslan Rahman / AFP - Getty Images
A featherless Humboldt penguin (2nd right) in a wetsuit walks past king penguins in the enclosure at the Jurong Bird Park in Singapore on April 4. The 10-year-old penguin has been experiencing continued feather loss since 2010 and is being treated with customised wetsuits. The suit acts like a natural feather covering, providing warmth and insulation which also helps new feathers grow and prevents moulting.
Roslan Rahman / AFP - Getty Images
Angelin, an avian management officer, puts a wetsuit on a featherless Humboldt penguin at the Jurong Bird Park in Singapore on April 4.
Roslan Rahman / AFP - Getty Images
A featherless Humboldt penguin in a wetsuit goes for a swim in the enclosure at the Jurong Bird Park on April 4.
See more great animal images in our Animal Tracks slideshow.