A quotation from Douglas Adams

If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family Anatidae on our hands.

Douglas Adams (1952-2001) English author, humourist, screenwriter
Dirk Gently, No. 1, Dirk Gently’s Holistic Detective Agency, ch. 30 [Dirk] (1987)

Sourcing, notes: wist.info/adams-douglas/29485/

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