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It might look like this giraffe has a dirty habit - but, astonishingly, it isn't actually smoking a cigarette .

The giraffe, snapped in the Mkhuze Game Reserve, South Africa, was in fact chewing an animal bone to extract minerals - but ended up looking like it'd gone for a puff.

And thanks to rolling it around in its rubbery lips, the animal ended up pulling some hilarious expressions in the process.

The photos were taken by Danish wildlife photographer, Mogens Trolle, after he had been out searching for animals to take portraits of.

(Image: MOGENS TROLLE/ CATERS)

(Image: MOGENS TROLLE/ CATERS)

Mogens said: "The giraffe, despite chewing on the bone to extract minerals looked distinctly like it was puffing on a cigarette.

"The giraffe twisting and turning the bone in its mouth gave some hilarious facial expressions.

(Image: MOGENS TROLLE/ CATERS)

(Image: MOGENS TROLLE/ CATERS)

"I love situations like that where the animals look funny and aren't necessarily exhibiting everyday behaviour.

"I like to do animal portraits and will always focus on their facial expressions and eye contact to see how it differs from humans.

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"This giraffe I just happened upon while I was out in the reserve looking for animals to photograph."