Scientists have discovered a way to tell the difference between penguins, but have you? BBC News website readers have been sending in their penguin pics including this one by Kathleen Bell.
Dawn Kelly was on her honeymoon in South Africa when these almost identical looking penguins decided to have a walk along Boulders Beach near Cape Town.
Olivia Johnson also went to Boulders Beach to have a look at the African penguins. She took this photo earlier this year.
Dejana Perrone spotted these penguins playing follow my leader. She took this photo in South Africa.
An adventurous penguin on Boulders Beach comes in for a closer look at Dawn Kelly's trainers. We're thinking they might be a couple of sizes too big for penguin feet.
Anna Schumann also went to Boulders Beach in South Africa to see the penguins.
Amber was disappointed not to see any penguins at the penguin pool in Marwell Zoo, Hampshire. Photo by Austin Core.
David Paterson was careful not to disturb this group of Chinstrap penguins with their chicks on Bailey Head in the South Shetlands, Antarctica.
Olivia Johnson managed to get quite close to this penguin family at Boulders Beach, South Africa.
Mike Wakefield from Ottawa in Canada took this photo of a couple of King penguins at Volunteer Point on the Falkland Islands.
The Gentoo penguins at this colony on the Falkland Islands are not fooled by Mike Wakefield's stuffed toy penguin.
Kathleen Ball sent us this picture of some Emperor penguins with their young. Send your photos to firstname.lastname@example.org. See terms and conditions on the right.