The animals didn't necessarily become sick, researchers said, but were encountering the new pathogens much more frequently.
Vitamin D deficiencies have long been a concern in high latitudes because sunlight — which stimulates its production in the body — is scarce in winter months.
State officials are now blaming toxoplasmosis, a parasite carried in cat feces, for the deaths of three critically endangered Hawaiian monk seals on Oahu.
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