...They are briefly alluded to by Willughby, in 1687, as small pigeons "which show like footballs in the air...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...As this light increased, a row of five shadowy bulks the size of footballs began to take form between what looked, from where the men sat, like a forest of fibers of silk...
Anthony Gilmore 「The Affair of the Brains」
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