Trilobites Made Tunnels

["Richard W. Travsky" <rtravsky@uwyo.edu>]

http://dsc.discovery.com/news/2006/08/10/trilobite_pla.html?category=earth&guid=20060810140030

Trilobites, the extinct marine creatures famous to fossil-hunters 
everywhere, may have once done digging of their own, say British and 
Swedish researchers.

Rocks found in a Swedish limestone quarry contain the remains of 
trilobites inside networks of tunnels, which appear to have been 
subsurface thoroughfares for the little bug-like critters.

"Its very rare to find a trilobite in a burrow," said Amherst College 
paleontologist Whitey Hagadorn, an expert on tracks, burrows and other 
trace fossils that can give important clues to a long-lost species 
behavior and environment.
...