Chemical in urine alerts prey species to a nearby predator.
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Ferrero, D. M. et al. Proc. Natl. Acad. Sci. USA advance online publication doi:10.1073/pnas.1103317108 (2011).
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Nosengo, N. The smell of a meat-eater. Nature (2011). https://doi.org/10.1038/news.2011.375