Beware “diluted” adult herrings, which may be hybrids with the glaucous-winged or the glaucous. Juvenile and first-winter herrings are extremely variable, but not like any other regular large ...
The study also provides the first evidence of play, specifically exploratory-object play, and the first reports of kleptoparasitism, a 'food thief' situation, among narwhals and glaucous gulls.
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