And to top it off, they have a technocolor Stegosaurus.  No, they don’t know that dinosaurs were brightly colored and patterned — but many critters are (consider birds, the “surviving dinosaurs” — and reptile scales as well), and there’s certainly no reason they had to be boring. It’s not as if an adult stegosaur spent a lot of time hiding…..

Killed other dinos by sitting on them…

http://en.wikipedia.org/wiki/Chicken

Edit: The Emperor Penguin is also cool. But I don’t know what that tastes like.

Only one specimen found and described in 1877.  The find included two vertebrae and a femur.  It’s all gone missing now, and all that remains are the descriptions and illustrations made by the discoverer, Edward Drinker Cope.

So there’s no evidence other than a described, but lost (or never existed) fossil.

It would have been twice as long as Argentinosaurus based on the Diplodocus scaling models, and would have weighed 122 Metric Tonnes.

But I’d say Argentinosaurus is definitely the largest known dinosaur that is proven to have existed.

Just a little exposition.  I think the deep time makes the perception of the key differences hard.  They all existed (shoutout to Sagan) billions and billions and billions of (let me do the unit math) picoseconds ago (160MYA ~ 10^27 picoseconds ~ (10^9)^3).  And the fact that Dimetrodons have been lumped in with dinosaurs in the popular media for around 100 years.

I will also call a woolly mammoth a dinosaur.

God dammit, this is what Power Rangers has done to my generation.

That’s when the show lost me: halfway through the first episode, when Zordon referred to “the Sabretooth Tiger Dinosaur and the Woolly Mamoth Dinosaur”.