T-Rex
Yes, of course the mosasaur was smart
pliosaur
Yes
Trex
Capitalize trex when you are using it as a proper noun, such as a specific thing or trademark.
trex
Yes
is trex decking safe for dogs?
Trex was 40ft long, but it is not the biggest meat eating dionsaur
No, TRex was Trianosaurus Rex, an extinct (fossil) dinosaur.
It lived in Europe and north america.
yes they did eat them after mating