Dinosaur

They originally roamed the planet about 240 million years ago

They became extinct about 66 million years ago

There were over 1,000 species of non-avian dinosaurs - It is estimated there could have been up to 3,400 species

Larry is non-avian

The largest land animal of all time, they could be up to 130 feet long and up to 59 feet tall

From the Greek Deinos (terrible, potent or fearfully great) and sauros (lizard or reptile)