File picture for illustration shows young parrots at Seropedica Recovery Center, a reserve of the Brazilian Environmental Institute near Rio de Janeiro, Brazil, on October 17, 2008

Swiss customs authorities said Thursday that they had arrested a bird specialist who smuggled the eggs of protected parrots in his underwear and travelled the globe trading in rare species.

The customs service said in a statement that the man, whom it did not identify, was though to have trafficked over 150 eggs from endangered that are protected by international law, as well as rare pheasant .

The man, a Swiss citizen who was also a legal bird trader, was busted at Zurich airport in 2010 with 25 eggs hidden in his underwear as he returned from Brazil.

The customs service explained that it was only revealing details of the case now because of the secrecy surrounding the probe.

Investigators managed to establish that thanks to a solid international network of contacts, the man managed to smuggle more than 150 eggs to buyers in Indonesia, Thailand and Mexico.

The total value of the contraband was 65,000 Swiss francs (54,000 euros, $71,000), the customs service said, adding that it had not been possible to establish where they came from.

Investigators said that the man also had an aviary of several hundred birds, including .

The Swiss veterinary service also seized seven rare parrots from an accomplice, with an estimated value of 8,000 Swiss francs.

The two men face a heavy fine for trafficking in endangered species.