3. Drugs
There are many ways in which traders in narcotics indulging in drug smuggling.
People have been found carrying drugs in their intestines, latex pouches covered in industrial sealants and aluminum foil inside their bodies.
Last year Afghanistan secured the world number one position as the producer and supplier of illegal opium, Canada is the leading supplier of ecstasy pills to North America.
4. Exotic animals and birds
Many bizarre stories are heard about the smuggling of animals and birds.
In 2005, customs officials in Melbourne, Australia, stopped a woman who had arrived from Singapore after hearing mysterious "flipping" noises coming from around her waist.
They found an apron under her skirt designed with pockets holding 15 plastic bags filled with water and 51 tropical fish.
There are several other instances of people getting caught trying to smuggle birds strapped to their legs, fishes in pouches made in aprons inside a long skirt, baby leopards, pythons, tiger cubs, frogs, monkeys in suit cases or just shipping the animals (like lizards, butterflies) in hollowed out books and cases.
The net market value of animal smuggling is approximately $20billion.