If there would be a top 100 chart of dinosaurs' popularity this guy would be the all time leader. The T-Rex had quite short arms but compensated for this disadvantage with big sharp teeth 20 cm high each. One of the biggest meat-eaters ever lived on the Earth (or at least in the last 66-68 millions years). They were up to 12.3-12.4 m in length. The head alone was around 1,25 meters! Our version is smaller and not dangerous at all. Wanna dig inside the predator's mind?