Usually
grouped with the Hypsilophodonts, Iguanodonts are considered to be the more advanced
of the “Beaked Dinosaur” (Ornithopoda) Family. Considerably larger than
Hypsilophodonts, Iguanodonts switched from walking around on two legs to going about
four legs. With their toothless beaks and specialized jaws, these Dinosaurs not
only could eat a wide variety of plants, but also break their food down more
efficiently.
As one of the first groups of
Dinosaurs ever to be discovered, the Iguanodon Family is also one of the best
known. Being a relatively successful Family, They lived from the middle
Jurassic to the late Cretaceous (about 100 million years). However, paleontologists
considered this Family to be a “waste basket” (artificial) grouping of Dinosaurs,
who were neither completely Duck-billed nor “Primitive Beaked” Dinosaurs. Moreover,
cladistics revealed that this group display the evolution of Dinosaurs from Hypsilophodonts
(“Primitive Beaked” Dinosaurs) to Hadrosaurs (Duck-billed Dinosaurs).
The Iguanodont Family reflects the
growth in people’s knowledge of Dinosaurs from the first historical discovery
to modern times. As we learned more about Dinosaurs, this Family became the measuring
stick for our growth in wisdom. Acting as the mirror to ourselves, the
Iguanodont Family tells us where we have succeeded or failed. When we want an
honest assessment of ourselves, we look to this Family for what next They will
reveal to us.