None of them noticed a large, tawny owl flutter past the window. I don't know why the author used the verb 'flutter' in the present tense. I think it is right using in the past tense 'fluttered' or a present participle 'fluttering'.
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marisskoNone of them noticed a large, tawny owl flutter past the window.There is a class of verbs in English, called verbs of perception, which are followed by the bare infinitive.