Regent's Park, is trying to communicate the SCALE of the exotic animal by comparing it to the nine onlookers behind it. A scale is a unit used in mathematics.
Scale is a characteristic of an object that does not change when it is multiplied by a given unit, thereby showing universality.
The units of scale in mathematics and physics include, among others, length and energy.
The value that is multiplied in a given scale is called 'common factor' and it is used to show universality.
Learn more about scales here:
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