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| Leopard marking its territory |
In a paper published in PLOS Computational Biology a couple of days ago, Lauren White of the University of Maryland's National Socio-Environmental Synthesis Center, Annapolis, MD, and colleagues have shown how a solution to the problem of parasitic infections, can create an opportunity for parasites to spread infections in a classic twist of an arms race.
Animals are liable to pass infections between them by physical contact, so one solution to this problem is for some species to be solitary and live within a territory. However, this solution only works if individuals are able to signal the borders of territories to other members of their species. Unlike birds, which often use song or calls, many species use scent markings placed at strategic positions.




















