HENRICO COUNTY, Va. (WRIC) -- Although the Richmond Marathon is over, runners in the River City didn't kick up those heels after Saturday, some traded their traditional shoes for a T-Rex suit.  This years' T-Rex Run, hosted by the Richmond Road Runners Club (RRRC), happened on Sunday, Nov. 17 and brought more than 100 people dressed in inflatable dinosaur costumes as a way to commemorate marathon weekend coming to an end.   “You don’t see this a lot," said RRRC Board of Directors member Donnie Lane. Scientists say there hasn’t been a Tyrannosaurus Rex on earth in 66 million years. But in Henrico, more than 100 were spotted. The T-Rex run took these creatures a little less than half a mile around the Dorey Park lake as a way to celebrate wrapping up the marathon weekend. “It’s like a recovery run," Lane said. “They get stiff, and the muscles tighten up, and that kind of thing. So, this gives them a chance to recover from yesterday’s races.”  And that’s exactly how Karen Wilder saw it.   “It’s a perfect bookend to [do] a full marathon and then a T-Rex-a-thon," Wilder said.   She ran the Richmond Marathon for the first time Saturday.   This event was just a fun run, no winner was officially announced. Inflatable full-body T-Rex costumes were preferred, but they didn’t discriminate against other species.   “You can’t resist the silliness of this event," Wilder said. "This is my fourth T-Rex Run I think.”