Cryptozoology is a term whose development is often attributed to the zoologist Bernard Heuvelmans. The word itself translates to mean the "study of hidden animals". This is exactly what cryptozoology is; the study and attempted prooving or disprooving of animals that have been reported by witnesses but have not been scientifically established as real. This discipline is one that has made relatively little progess when compared to other scientific fields, and some don't even consider cryptozoology to be a true science at all.
While it is true that cryptozoology cannot be tested as objectively as hard sciences such as chemistry and physics, it does give us the opportunity to expand the currently accepted animal kingdom. Unfortunately, many attempts to uncover the animals in question, often called "cryptids", have met with little success. Many of the big names in cryptozoology, such as Bigfoot, Chupacabras and the Loch Ness Monster, still refuse to devulge their existance to us, if indeed they exist.
Although cryptozoology is the study of currently unrecognized animals, I feel that this science should be expanded to cryptobiology, a field which covers all unknown life forms, including plants. Relative to cryptid animals, cryptid plants are in short supply, but they still warrant out attention because of their strange features.