Flies are attracted to and find their food through smell. The Venus flytrap has evolved just that. It uses a sweet-smelling nectar to lure the prey into its traps. This symbiotic relationship between the Venus fly trap and root-maggot flies, or any other flies and insects it feeds on, is a parasitic relationship; the plant benefits by gaining nutrients at the the extent of its prey's life. Click here to watch a video of the Venus fly trap in action, i.e. trapping and digesting a fly.
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