What was diplodocus brain size?

The brain size of a Diplodocus was relatively small compared to its massive body, weighing only about 0.5 to 1 kilogram (1 to 2.2 pounds). This is quite small for an animal that could reach lengths of up to 85 feet (26 meters). The brain's size suggests that Diplodocus relied more on instinctual behaviors rather than complex problem-solving capabilities. Overall, its brain size reflects the typical characteristics of large sauropods.