I know that birds are decended from dinosaurs, and that birds do not have sphincter muscles to control when and where they poop. I am curious if dinosaurs pooped in the same way.

Thank you for taking my question.

Natasha Lewandrowski

This is one of those physiological questions that may never be directly answered from the fossils.  However, given the way that birds and crocodillians defacate (unless I'm wrong that crocs are similar), it's reasonable to think Dinosaurs did it the same way.