table cellspacing=0 cellpadding=1 tr td valign=top a href=http://news.nationalgeographic.com/news/2008/10/081015-tiktaalik-evolution-missions.html?source=rss img src=http://news.nationalgeographic.com/news/images/thumbs/081015-tiktaalik-evolution-missions_60x40.jpg height=40 width=60 alt=image / /a /td td valign=top pThe skull of a 375-million-year-old walking fish reveals new clues to how our fish ancestors evolved into land dwellers, a new study says./p /td /tr/table