Remarkable Fossil Sea Creature -- 525 Million Years Old -- Shows Soft Parts of Body Including Tentacles   Science Daily - March 29, 2011

Land Vertebrates Arose 18 Million Years Earlier   Science Daily - January 8, 2010

Oldest Land-Walker Tracks Found - Pushes Back Evolution   National Geographic - January 6, 2010

The finding of 395-million-year-old footprints in Poland turns back the clock on the evolution of tetrapods.

  Fossil tracks record 'oldest land-walkers'   BBC - January 6, 2010