The crew of the Auckland Westpac Rescue Helicopter were called to the Mangawhai vicinity to assist a patient who was attacked by a bull at 12.50pm today.
The man in his 50s was flown to Whangārei Base Hospital in a serious condition.
In April last year a young boy was attacked by a 500kg cow in Geraldine while watching his sister compete in a local adventure race.
A Canterbury West Coast Air Rescue spokesman said the 7-year-old was with his family when the cow jumped the fence and stomped on him.