In the wildlife clinic at Tufts University’s veterinary school, Mark Pokras is slicing into the stomach of a North Atlantic seabird to see whether it might have succumbed to environmental or biological toxins. After getting past the snowy-white feathers of the emaciated gannet (similar to a pelican), he pokes around for signs of poisoning or accidental ingestion of foreign objects, like lead fishing sinkers or plastic fragments. (Subscription required.)
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