Humboldt penguin (The Zoo - ITV)

Humboldt penguin (The Zoo - ITV)

An emperor penguin chick calling for its parents. (Penguins: Spy in the Huddle - BBC)

An emperor penguin chick calling for its parents. (Penguins: Spy in the Huddle - BBC)

A Humboldt penguin in the Atacama Desert. (Untamed Americas - NGC)

A Humboldt penguin in the Atacama Desert. (Untamed Americas - NGC)

A penguin chick gets tucked in. (Planet Earth - BBC)

A Southern Sea Lion chases a Gentoo Penguin. (Frozen Planet - BBC)

A Southern Sea Lion chases a Gentoo Penguin. (Frozen Planet - BBC)