There are other carnivorous plants similar to that rat-eating plant. These plants usually eats insects and other small animals. They use different trapping mechanisms to catch bugs and animals.
1. Pitfall traps (pitcher plants) trap prey in a rolled leaf that contains a pool of digestive enzymes or bacteria.
2. Flypaper traps use a sticky mucilage.
3. Snap traps utilize rapid leaf movements.
4. Bladder traps suck in prey with a bladder that generates an internal vacuum.
5. Lobster-pot traps force prey to move towards a digestive organ with inward-pointing hairs.
(list from wikipedia.org)

While there are still existing plants like these, there are also other species which doesn't anymore exist.

Examples of carnivorous plants species are the following († means they're extinct):
* 1 Aldrovanda
* 2 †Archaeamphora
* 3 Brocchinia
* 4 Byblis
* 5 Catopsis
* 6 Cephalotus
* 7 Darlingtonia
* 8 Dionaea
* 9 Drosera
* 10 †Droserapollis
* 11 †Droserapites
* 12 †Droseridites
* 13 Drosophyllum
* 14 †Fischeripollis
* 15 Genlisea
* 16 Heliamphora
* 17 Ibicella
* 18 Nepenthes
* 19 Paepalanthus
* 20 †Palaeoaldrovanda
* 21 Pinguicula
* 22 Roridula
* 23 Sarracenia
* 24 †Saxonipollis
* 25 Stylidium
* 26 Triphyophyllum
* 27 Utricularia
* 28 See also
* 29 References

See http://en.wikipedia.org/wiki/List_of_carnivorous_plants for more details...

Some carnivorous plants are seen in the wild such as in the forest or even in some ponds. Some botanical gardens and parks where they are being taken care to keep them from extinction.
Source(s):
http://en.wikipedia.org/wiki/List_of_carnivorous_plants
http://en.wikipedia.org/wiki/Carnivorous_plant

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