The discovery was made by scientists carrying out the first study of how the snappy plants are pollinated in the wild.

Surprised scientists found that Venus flytraps tend not to bite the hand that helps them reproduce.

Prey was recovered from more than 200 of the plants at study sites in North Carolina, US.

The three most important pollinator species - a bee and two kinds of beetle - were never found in the traps, despite often visiting flytrap flowers.

Venus flytraps have a built-in safety feature that prevents them gobbling up their friends, the researchers found.

Dr Elsa Youngsteadt, from North Carolina State University, said: "Venus flytrap flowers are elevated on stems that stand fairly high above the snap traps of the plant, and we found that 87 per cent of the flower-visiting individuals we captured - including all three of the most important species - could fly.

"But only 20 per cent of the prey could fly. The pollinator species may simply be staying above the danger zone as they go from flower to flower, making them less likely to be eaten."

Other factors may also come into play, including colour and scent signals, said the researchers writing in the journal American Naturalist.