I WONDR - How Fast Was The Brontosaurus?

The Brontosaurus, contrary to expectations, could move at speeds between 12 and 18 miles per hour. It was a massive dinosaur, measuring about 72 feet in length and 80.3 feet in height, and weighing between 14 to 17 tons, equivalent to three elephants. Its neck could extend over 19 feet. Despite its size, the Brontosaurus was not aggressive and did not attack predators, but it could defend itself effectively with its powerful tail.

What could the neck of the Brontosaurus reach in length?

Describe the defensive behavior of the Brontosaurus.