All smiles... probably after they discovered the bag of diamonds a passenger left behind.

A live parrot, a glass eye and a bag of sand are just a few of the many bizarre items left behind on planes each year, according to a survey of 700 international cabin crew by travel search website Skyscanner.net.

Cabin crew members revealed an extensive list of items they have found on flights after passengers have disembarked.

Animals and birds account for several of the more unusual items, including a falcon, a frog, a tortoise and a (live) parrot.

Dentures, underwear, a glass eye and a prosthetic leg were also on the long list of weird and wonderful items abandoned at the end of a flight.

Other random curiosities discovered include a single egg (without packaging), a bag of sand, and a written marriage proposal. Whether the latter was intended for a cabin crew member or a passenger is unclear. And let’s hope the wedding dress left in the overhead locker found its owner before the big day.

Almost a quarter of crew have found a lost passport on board

When it comes to the more regular travel essentials, it seems that passengers are no less forgetful. Almost a quarter (24 per cent) of crew have found a lost passport on board, which is even higher than the number of phones (23 per cent) and books (21 per cent) left behind.

Some of the most random items cabin crew have found on aircraft

• Live parrot
• Glass eye
• Prosthetic leg
• A bag of sand
• A clog
• Box of dried fish
• One shoe
• Wedding dress
• Bag of diamonds
• Wig
• Bag of onions
• Toupee
• Handcuffs
• Double bass
• One egg (without packaging)
• Frog
• Underwear
• Written marriage proposal