Is it okay to call them "seagull" not "petrel"?
Seagulls and petrels are actually two different groups of birds, as they belong to two separate bird orders. The bird in this video is a "petrel", but these birds are different from seagulls, as they are usually much larger and have different characteristics. So if you were to call them "seagulls" instead of "petrels", it wouldn't have the same meaning. However, both seagulls and petrels have in common that they are both seabirds.
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