1. Bigfoot / Sasquatch / Yeti
These hairy apemen are probably the most consistently witnessed unknown creatures in the world. Whether they are called Bigfoot, Sasquatch, Yeti, Skunk Ape or Yowie, they have been seen in isolated woodlands and mountain areas in virtually every corner of the globe. And the descriptions - from the North American northwest to Florida to Australia - are remarkably consistent:

• taller than an average man (seven to eight feet)

• covered with long brown or auburn hair (or white hair in the case of the Yeti)

• a strong, repugnant odor

• large feet, as evidenced by castings of footprints

• an aversion to man

• a piercing, eerie howl

The vast number of sightings, many by highly reliable witnesses, gives Bigfoot, in my estimation, the best likelihood of being a real creature as yet unknown to science. But what is it? A missing link? Some ancient relative of humans that somehow has survived in the wilderness? An unknown species of ape?

We may find out someday soon. Sightings seem to be on the increase as mankind encroaches deeper and deeper on the wilderness. And technology may aid in the search. The Bigfoot Field Researchers Organization recently announced its intention to place motion-triggered digital webcams in various areas of US forest where the hairy beast has been seen. This 24-hour surveillance with potentially thousands of computer-based witnesses looking on will dramatically increase the chances of obtaining credible evidence.

For the diehard skeptic, nothing less than a captured specimen will do - or at least some other tangible evidence. And one that could qualify has recently emerged: an impression of Bigfoot's butt. No kidding. Researchers in the American northwest have found what appears to be the impression in the ground of where a large hairy primate has sat. Hey, he's got to rest those big feet sometime.

2. Loch Ness Monster (and other Lake monsters)
Despite excellent expeditions with sophisticated electronic equipment, the lake monsters of the world continue to elude scientists. Yet spontaneous sightings by good witnesses, although rare, persist.

The Loch Ness monster, or Nessie, is undoubtedly the most well-known of these aquatic mysteries. But other deep, cold lakes around the world have their own legendary beasts: Chessie in Chesapeake Bay, Storsie in Sweden's Lake Storsjön, Selma in Norway's Lake Seljordsvatnet and "Champ" in New York's Lake Champlain among others.

Descriptions of this creature, too, are amazingly similar:

• a large creature with a long neck

• a horse-like head

• a humped back

Most sightings report the humps protruding from the surface of the water (which skeptics dismiss as being almost anything, from schools of fish to floating logs), but occasionally a lucky witness will see the creature stretch its neck high above the water and look around a bit before submerging.

Photo and video evidence is rare. And although some of the photos are tantalizing (most notably the famous "flipper" photo taken by the Rines expedition in 1975), most such "proof" is fuzzy or inconclusive at best.

If the creature does exist, many researchers suspect that it could be a kind of plesiosaur - an animal from the age of the dinosaurs that is thought to have become extinct more than 66 million years ago. Could a lineage of these incredible creatures possibly have survived?

3. Chupacabra
Even though some sightings date back to the 1970s, El Chupacabra - "the goat sucker" - is primarily a phenomenon of the 1990s, and its fame has largely been spread by the Internet. The sightings started in earnest in 1995 with reports coming out of Puerto Rico of a strange creature that was killing farmers' livestock - chickens, ducks, turkeys, rabbits and, of course, goats - sometimes hundreds of animals in one evening. The farmers, who were familiar with the killing practices of wild dogs and other predators, claimed that the methods of this unknown beast were different. It didn't try to eat the animals it killed, for example; nor did it drag them away to be devoured elsewhere. Instead, the creature killed by draining its victims of blood, usually through small incisions.

Then came the bizarre eyewitness descriptions:

• about the size of a chimpanzee

• hops about like a kangaroo

• large glowing red eyes

• grayish skin and hairy arms

• long snake-like tongue

• sharp fangs

• quills running along its spine that seem to open and close like a fan

• some believe it may even have wings

Toward the end of the '90s, the sightings of Chupacabra began to spread. The creature was blamed for animal killings in Mexico, southern Texas and several South American countries. In May and June of 2000, a rash of incidents took place in Chile, according to certain newspapers there. In fact, some of the most incredible claims yet came out of those sightings: that at least one of the creatures was caught alive by local authorities, then handed over to official agencies of the US government.

What is it? Theories abound, including: an unknown but natural species of predator; misidentified known predators; the result of genetic experimentation; an alien. Most serious researchers consider Chupacabra merely folklore, perpetuated by over-enthusiastic locals immersed in superstition or a penchant for telling tall, exaggerated tales.

Yet you can be sure that we haven't seen or heard the last of Chupacabra.

More Monsters

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