Eating mice

My girls have discovered a mouse nest in the garden somewhere and are devouring the baby mice. We've tried to stop them but they're too fast to catch to take the mice off them. Is this normal chicken behaviour?

Ok, thanks.    We're trying to keep them away from that side of the garden as much as possible, but between our cats and our chickens sadly 7 little mice lost their lives yesterday!! 
It is quite comical though to watch one hen with a mouse in its beak streaking across the garden with the others in hot pursuit. Once they've shown off how clever they are, they just down the mouse in one. I couldn't believe what I'd seen......until I saw the next one do the same!!  Shame for the little mice though!

and just wait until they catch a frog - the poor thing becomes a 4 way tug of war. Chickens are the modern equivalent of a velocirapter 

I have to be carefull when lifting some fallen fencing panels there are no frogs under them as I found out to one of their costs.

one also took a baby chick that had fallen from a  nest!!!!!!!

its all good and well watching them eat these critters but we keep meat birds and it really turns my stomach when i think we'll be indirectly eating mice, frogs, worms, flies, caterpillars, slugs, snails.........

Mine are partial to the odd slow worm ... I do chase them around and release the poor thing ... One de girls took on more than she could handle and had to rescue her from a slow worm as it wrapped itself around her head and she was suffocating ... She still went back for more !! X

Yes that's why I quickly grab them and release them ... Do try and check around before the girls get out