Dark-grey lone dinosaur, very cool!

[Bruton the Iguanodon]

I just noticed this the other day. When we first see Doc in the flashback he's a different color then he is in the rest of the movie. It looks awesome!  

Then again, maybe it's just cause he's in the shadow, which is why Petrie is apparently a black flyer when he first appears.

Either way, he sort of looks like "Nelly" from LBT 4.