What is the typical length range in millimetres cited for adult Christmas beetles?
Answer
Between 20 and 30 millimetres.
The size of the adult Christmas beetle is a notable physical characteristic, generally falling within a specific measurement range. These insects typically measure between 20 and 30 millimetres in length when fully developed. This size contributes to their noticeable presence, especially when they are found congregating around outdoor light sources or flying into homes, distinguishing them from smaller flying insects.

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