User:Abyssal/Prehistory of North America/DYK/59
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Trachodon_mirabilis.jpg/77px-Trachodon_mirabilis.jpg)
- ...that Trachodon, despite being a well-known and often-used duckbill name in the past, is based on teeth that include both duckbill and horned dinosaur specimens?
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Perry_Road_toward_ridgeline.jpg/100px-Perry_Road_toward_ridgeline.jpg)
- ... that the Francis Farm Petroglyphs are among Pennsylvania's leading petroglyph sites, even though the culture of their creators is unknown?