A teenage boy has been flown to hospital after his quadbike collided with a sheep.

The Auckland Westpac Rescue Helicopter was called to a Te Kauwhata farm about 6.30pm yesterday, said a spokeswoman.

"They treated a teenage male patient who had been involved in a motorbike accident.

"He had been riding the bike at high speed when he had hit a sheep and fallen over the bike's handlebars."

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The boy was flown to Waikato Hospital in a moderate condition with a leg injury.

The condition of the sheep was unknown.