Indian authorities say they have arrested a Canadian man at Delhi airport for carrying a crocodile skull in his luggage.

The 32-year-old man was at the airport on Monday to catch his flight to Canada when he was first stopped during security check.

"Upon examination, a skull with sharp teeth, resembling the jaw of a baby crocodile, weighing approximately 777g (1.71lb), was discovered wrapped in a cream-coloured cloth," Delhi customs said in a statement on Thursday.

The man was arrested and the skull was handed over to the Department of Forests and Wildlife, they said.

Officials said the possession of crocodile skull violated India's wildlife protection law and its Customs Act.

An analysis of the skull by the Department of Forests and Wildlife found that it belonged to a species protected under India's Wildlife Protection Act.

"The texture, tooth pattern, well-developed bony palate, and nostrils confirmed the item as the skull of a baby crocodile," they said.

A forest official told the Times of India newspaper that the man had allegedly bought the skull from Thailand.

"The man did not possess the mandatory permission required to carry wildlife items," forest officer Rajesh Tandon said.

The man also told officers he had not hunted or killed the crocodile, the Hindustan Times reports.

Further tests are being carried out to identify the exact sub-species of the animal.

Meanwhile, Delhi customs says a case has been registered against the man and an investigation is underway.

Last year, a 32-year-old Canadian woman was stopped at Delhi airport after she was found to have horns of an unidentified animal in her luggage.

The woman told officials she had picked them up during a trek in the northern Ladakh region and decided to take them back as a souvenir.