WRT to funny units consider this thread (in German):
https://ruhrpott.social/@Matze/110812742577889798
Matze wrote:
I read the 'as big as a song thrush' as a size and I find that we should
set 'song thrush' as a standard unit for 20-22 cm.
Text problem:
Calculate how many square song thrush amount to a Saarland.
(Saarland is the smallest federal country of Germany that is not only a
city and often quoted for size comparison.)
Magdalena calculated that with a given song thrush size of 20cm, one
square song thrush is 400 cm² and a Saarland is about 64,250,000,000
square song thrush.
;)
HR