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LETTERS
Hibernation can also cause high ¹⁵N values in cave bears: A response to Richards et al.

Aurora Grandal d'Anglade^* and Daniel Fernández Mosquera

Instituto Universitario de Xeoloxía "Isidro Parga Pondal," Universidade da Coruña, E-15071 A Coruña, Spain

	To the Editor:

 
A recent paper Richards et al. (1) shows the highest ¹⁵N values of fossil collagen in adult cave bears found until now. The reviewing of previous papers makes them propose, as the only viable explanation, an omnivorous feeding for these specimens. However, they erroneously quote the hypothesis shown in our paper (2) in . . . [Full Text of this Article]

*To whom correspondence should be addressed. E-mail: xeaurora@udc.es

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Related articles in PNAS:

Reply to Grandal and Fernández: Hibernation can also cause high ¹⁵N values in cave bears

Erik Trinkaus and Michael P. Richards
PNAS 2008 105: 15. [Extract] [Full Text]