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Thank you everyone for your replies, the cat often brings animals home some half alive which we humanely kill and some still living which we release back into nature, I know the cat does this it was just the fact that the shrew was pregnant and just wanted to know if there was anything we could do to give the babies a chance, after about 5 minutes they stopped moving inside the mother so we knew they had died too. We put her back in the garden, so the circle of life could continue. Thanks again for your replies!!