
In India, a southern plains gray langur grooms a resting dog. Evolutionary theorists have puzzled over such altruistic behaviors, particularly among unrelated creatures, because selfishness often seems like a better survival strategy in the context of natural selection. A new theory suggests that parasites might tip the odds in favor of host altruism for their own gain.
Source: https://www.quantamagazine.org/archive/page/3
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