The first pillar boxes designed by the Royal Mail were in fact green, not red, to blend in with the landscape so as not to be an eyesore. However they blended in a little too well and the Royal Mail office was flooded with complaints from people who couldn’t actually find their local post box. The decision was then made to paint them red in 1874, which took around ten years for the repainting of all the post boxes to actually take place, so the iconic red post box was not actually fully recognised until the late 19th century. Although their design has not changed one iota since.
It is actually possible to send dead animals as well as live ones, so long as the packaging or animal itself does not violate local postal laws about shipping biohazard materials. If the animal has been cleaned and preserved properly, and is kept in an air tight container then it is perfectly legal to be allowed to ship it.
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