Dododex
ARK: Survival Evolved & Ascended Companion
You can actually build on these guys back.

More Brontosaurus Utility Tips
Just found out something really useful about Brontos! You can use them to transport goods a long way, but sometimes you have more than the bronto can carry, so, if you pack your resources on something like a high level parasaur or iguanodon, and put it on the platform saddle, it only takes the Dinos drag weight, not resource weight, allowing you to carry tons of materials at half the weight!
Gotta pesky tribe nearby...
No worries... Here at bronto ramp specialistz have you covered..
Using our not so patiented technology by building a down ramp on 1 side and an up ramp on the other...
We make even the stout bohemeth gates breachable for friend and foe animals alike
These things can be aggroed on by:
Allosauruses,
Spinos,
Rexes,
Alpha Rexes,
Yutyrannuses,
Carcharos,
Gigas,
Rhynios,
And finally megatheriums that somehow got the insect buff
If it is able to aggro onto a bronto without it aggroing the animal first that means it is aggressive to and will attack any and all other tames.
This also applies to the paracer as in terms of prey the paracer can be aggroed on by the same creatures listed above.