| Publication Type: | Journal Article |
| Year of Publication: | 2009 |
| Authors: | D. W. Purves |
| Journal: | Proceedings of the Royal Society B: Biological SciencesProceedings of the Royal Society B: Biological Sciences |
| Volume: | 276 |
| Pagination: | 1477-1484 |
| ISBN Number: | 0962-8452 |