Over 500 million years ago, these huge predatory worms prowled the Cambrian seas.
Authorities ordered local residents to remain indoors as efforts were made to capture the beast.
An escaped lion on the loose in Germany has prompted an extensive police search that has lasted for days.
The animal, which had sent two people to the emergency room in Suwannee county, was not quite what it seemed.
A large bipedal wolf-like creature has reportedly been sighted in and around Walworth County for years.
Bipedal ape-like beasts are welcome in the forests of Clallam County, officials in Washington have declared.
These giant prehistoric beasts, made famous by Game of Thrones, were part of a mysterious ancient lineage.
Two hunters have been seeking answers after finding unusual footprints in the remote English countryside.
A strange mammal that lived in Madagascar has been described as 'one of evolution's abandoned experiments'.
This strange eyeless sea beast is rumored to have come from the depths of the Pacific Ocean.
A former marine ecologist is aiming to use underwater cameras to spot an elusive lake beast in Alaska.
Police in England have discovered the paw prints of a large exotic cat believed to be on the loose in the area.
One of the largest wildcats ever seen anywhere in the world has been caught on camera in Aberdeenshire.
A recent excavation in the heart of Los Angeles has yielded evidence of giant prehistoric beasts.
An unidentified motorist ended up hitting a deer in her car after being distracted by a 'hairy beast'.
A new study has cast doubt on the idea that climate change wiped out most of Australia's huge beasts.
A strange hairy beast made headlines after it was felled by an Australian cordial manufacturer in 1893.
A zoo owner has come forward with information that could help to explain the alien big cat phenomenon.
A large horned beast known as the 'Siberian unicorn' could be the origin of the modern unicorn legend.
The woolly mammoth is not the only prehistoric beast that modern science could bring back to life.