Corrected entry: The boy in the film had collected urine from a T-rex to keep raptors away. There's a problem with that: dinosaurs were reptiles and were related to birds. Birds and reptiles do not urinate like mammals; they excrete uric acid together with their faeces through a single excretory opening called a cloaca.
J I Cohen
27th Aug 2001
Correction: There's a lot of assumptions there. We can't be sure whether or not dinosaurs urinated, it seems unwise to assume they did not merely because modern reptiles and birds don't.
J I Cohen