Sydney -A kayaker left stranded for days on a small Australian island after his craft was attacked by a crocodile was rescued by helicopter on Saturday, authorities said.The intrepid man was about 3km from Townshend Island, north of Rockhampton in Queensland, when the animal lunged at him on Wednesday.He paddled furiously to land at the island, but was then stranded there by a combination of bad weather and tidal problems."He was very fortunate," a spokesperson from the Australian Maritime Safety Authority, which co-ordinated the rescue, said."It didn't pierce the kayak. He said he was running on adrenaline [to get to the island]."The man remained on the island until Saturday when he reluctantly activated his personal locator beacon, alerting authorities to his location, after he ran out of provisions.Saltwater crocodiles have become more common in northern Australia since they were declared a protected species in 1971. They are estimated to kill an average of two people each year.Several hundred are culled every year in Queensland and neighbouring Northern Territory to protect the public and livestock.In May, a 46-year-old woman was presumed taken by a crocodile in far north Queensland when she disappeared after she went into shallow water at night.