Happy the cow was never destined for greatness, born as he was a bull on a dairy farm.

Yet despite his inability to produce milk, Happy had another valuable skill that began working the minute he dropped onto the grass of Barry Coster's dairy-making people smile.

The Holstein calf was born with a smiley face on one side of his body, a result of the naturally random black and white markings typical of their breed.

"We've seen some number sevens or love hearts on the head, and a few strange markings, but we've never seen anything that resembles a smiley face before," Mrs. Megan Coster told ABC Australia.

Upon finding Happy, Brian snapped a picture and sent it to Megan who even suspected he was a victim of graffiti.

"I couldn't believe it-I actually zoomed in at first to make sure that none of our workers had added some extra lines or anything, " she added.

Happy is what is known in the Australian dairy industry as a "bobby calf" meaning one that is surplus to requirements for replacing the existing stock.

Rather than joining the mating bull herd, Happy's unique markings have landed him a role on the farm in perpetuity.

Mr. Coster said many of his workers were keen to have him around as a kind of mascot. He makes people smile, and he's one heck of a natural lawnmower.

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