Triffids

Triffids are an aggressive terrestrial life form of undistinct origin. They are plant based organisms, but possess certain characteristics common to members of the animal kingdom. They possess mobility, which enables them to uproot themselves from the earth and move about. They have a predatory instinct to feed. They are carnivorous and sustain themselves on nutrients they derive from human beings. A Triffid will stalk its prey, then lash out at them with a barbed stinger which injects a powerful toxin into the victim's body. They hover above their prey as the victim then quickly breaks down into a pile of protoplasmic matter, at which point, the Triffid is able to consume the remains.