As someone else here has said, they appear to have had their tails bitten off as pinkies. I had a mama mouse once that would bite the toes off her young, and they would appear to have been born without digits. Needless to say, that mama mouse became snake food!

There are genetic mutations which cause short or no tail, but quite often this comes with lethal genes ( mating two mice together who both carry the gene causes the young to die before birth).
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Bob
Pyromaniac AKA Greatballzofire
Keeping cats allows man to cohabitate with tigers. Keeping reptiles allows man to cohabitate with dinosaurs.

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