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In the natural world, mimicry can be a very useful trait - one that might serve any number of purposes.
It is so ubiquitous, and seen in so many species, that animals have to be quite discerning when trying to weed out a pretender.
But it can be pretty hard even for animals who are constantly targeted - like Robins, and their beautiful blue eggs.
But how sensitive are they to foreign invaders? 
Dr Mark Hauber, Professor of Host-Parasite Interactions in the Department of Evolution, Ecology, and Behavior; University of Illinois at Urbana-Champaign joins to discuss.
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