Normally females with pups should not be left together, but there is
an exception. Both females must give birth within days of each other.
In order to insure that both females will have the hormonal or brain
chemical inhibitions needed to avoid hurting the pups. This is why
gerbils are able to foster pups when their pups are less than 14 days
old. After 14 days old mothers will kill strange pups. Im not sure if
this theory is correct but I am basing it on past GML emails and
misguided gerbil books prior to the internet age. So they're were
times it did work. However, as gerbils got older and birthing cycles
didn't match, pups were injured and killed.
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