In order for a plant to be considered carnivorous, it must 1) attract prey, 2) capture prey, and 3) digest the prey. Many plants are able to do the first two criteria, but few actually do all three. Some fall into a gray area and are considered quasi or semi carnivorous.
Worldwide, there is an ever increasing danger of the reduction and loss of Carnivorous Plants. Most of these threats are from human encroachment upon the habitats of Carnivorous Plants, which are often slow-growing plants.
Carnivorous Plant hybrids are crosses between two different species. For example Sarracenia purpurea x Sarracenia flava creates the hybrid Sarracenia catesbaei, common name: Cate's Pitcher Plant. Crosses can occur naturally or artificially, by selecting desired characteristics.