I WONDER - How Did The Diplodocus Defend Itself?

The Diplodocus, a massive dinosaur, had a long whip-like tail capable of creating loud sonic booms to deter predators. Its straight leg bones supported its enormous weight, but despite its size, it could only move at a slow pace of 2 to 4 mph, making it vulnerable to predators.

What type of leg bones did the Diplodocus have, and why were they important?

Why was the Diplodocus unable to escape from predators quickly?