With up to 20 living species, penguins are among the most amazing creatures alive.
They are birds that cannot fly, but they can swim better than many ocean animals.
They live in the freezing depths of Antarctica and the relative warmth of the Galapagos Islands.
And they have this incredible ability to make us think they are cute.
So to celebrate World Penguin Day, here are 15 wonderful photos of penguins.
Chinstrap penguins (Pygoscelis antarctica) on a blue iceberg, with an Antarctic prion (Pachyptila desolata) flying over.
A Gentoo penguin (Pygoscelis papua) jumping out of the sea at Cuverville Island, Antarctic Peninsula, Antarctica.
Emperor penguins (Aptenodytes forsteri) chicks on Snow Hill Island, Antarctica.
A Royal penguin (Eudyptes schlegeli) living on Macquarie Island, Sub-Antarctic Australia.
A porpoising Adelie penguin (Pygoscelis adeliae) reflected in the Antarctic water.
A Chinstrap penguin (Pygoscelis antarcticus) in snowfall on Useful Island, Antarctica.
A Gentoo penguin (Pygoscelis papua) chick begging its parent for food in Antarctica.
An Emperor penguin (Aptenodytes forsteri) toboganing on ice, in the Weddell Sea, Antarctica
And to acknowledge that a penguin's life is never easy, a Leopard seal (Hydrurga leptonyx) having taken an Adelie penguin (Pygoscelis adeliae) prey underwater, Antarctica.
Emperor penguins (Aptenodytes forsteri) diving in Antarctica.
A pair of Emperor penguins (Aptenodytes forsteri) in a courtship ritual, with their chick looking on. Taken on the Dawson-Lambton glacier, Weddell Sea, Antarctica.
The face of a Chinstrap penguin (Pygoscelis antarctica)
King penguin chicks (Aptenodytes patagonicus) line the shores of South Georgia Island, Antarctica.
A Little or Blue penguin (Eudyptula minor) in its burrow in New Zealand.
A Gentoo penguin (Pygoscelis papua) surfing onto a beach at Carcass Island, Falkland Islands.