Giant boid snake from the Palaeocene neotropics reveals hotter past equatorial temperaturesDOI: info:10.1038/nature07671v. 457No. 7230Macmillan Publishers Limited. All rights reserved715–717
Head, Jason J., Bloch, Jonathan I., Hastings, Alexander K., Bourque, Jason R., Cadena, Edwin A., Herrera, Fabiany A., Polly, P. David, and Jaramillo, Carlos A. 2009. "Giant boid snake from the Palaeocene neotropics reveals hotter past equatorial temperatures." Nature, 457, (7230) 715–717. https://doi.org/10.1038/nature07671.