Researchers have found that acoustic tags used to study fish migration and behavior may serve to help seals, and perhaps other predators, to locate their prey. This could have serious ramifications for any studies of predation that use such devices. The American Academy for the Advancement of Science has a short article on this, here: http://news.sciencemag.org/plants-animals/2014/11/fish-tagged-research-become-lunch-gray-seals

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