located by the Oxford English Dictionary, is in a 1949 newspaper advertisement. Squirrel cages featured in an 1876 and 1885 catalog by Osborn Manufacturing Co. came with running wheels for the squirrels, similar to hamster wheels.

Preferences

Choice tests with Syrian hamsters (Mesocricetus auratus) have shown that they prefer larger wheels; the animals chose a wheel diameter of 35 cm over 23 cm,

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