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buy lasuna Since the late 1990s, however, type E botulism in birds has become an annual event in one or more of the Great Lakes resulting in very large kills in some years. Two non-native species, round gobies and quagga mussels, appear to play a key role in this change of pattern. Botulinum toxin, generated in the vicinity of mussel beds, possibly in rotting mats of algae, is picked up by the filter-feeding mussels.