Scientists excavating at the Schoningen open-cast coal mine in north-central Germany have discovered the remains of a saber-toothed cat preserved in a layer some 300,000 years old - the same stratum in which wooden spears were found.
The finding indicates that early humans also inhabited the area, which at that time was the bank of a shallow lake.
The discovery sheds new light on the relationship between early humans and beasts of prey, researchers said.
It is highly likely that humans were confronted by saber-toothed cats at the Schoningen lakeside.
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In this context, the Schoningen spears must be regarded as weapons for defence as well as hunting - a vital tool for human survival in Europe 300,000 years ago.
Officials from the Lower Saxony heritage authority and archaeologists from the Universities of Tubingen and Leiden uncovered a first tooth of a young adult homotherium latidens in October 2012.
Measuring more than a metre at the shoulder and weighing some 200kg, the saber-tooth was no pussycat. It had razor-sharp claws and deadly jaws with upper-jaw canines more than 10cm long.
Along with the sensational wooden spears, the same level has yielded bones and stone tools indicating that early humans - probably homo heidelbergenis - hunted horses and camped along a 100m stretch of the lakeside.
The finding demonstrates that a long time before anatomically modern humans, homo sapiens sapiens reached Europe some 40,000 years ago, early man was able to defend himself against highly dangerous animals with his weapon technology.