Oldest duck-billed dinosaur
- Who
- Protohadros byrdi
- What
- 95500000 year(s)
- Where
- United States (Flower Mound,)
- When
- 1994
The oldest duck-billed dinosaur so far discovered is the hadrosaur Protohadros byrdi, which dates back 95.5 million years and which was found near Flower Mound, Texas, USA in 1994 by Gary Byrd.
The dinosaur bones show that it stood 1.82 m.(6 ft) high, with the added of advantage of walking on both four or just two legs and was 4.5 - 6 m. (15 - 20 ft) long.