We are pleased that our research has drawn the attention of others interested in applying stable isotope techniques to questions of paleobiology, and we are happy to reconsider our paper in light of the comments of Barrick and Kohn. However, we remain convinced that our interpretation of the data is the most parsimonious, and we maintain that δ18O-latitude gradients can be used to infer that some theropod dinosaurs were endothermic homeotherms. Lastly, we are glad that others are beginning to recognize the paleoclimatic implications of this research.

Rationale. Assessing behavior and physiology in the fossil record is a...

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