I'm glad I read thispost because I was wondering the same thing about chickens eating a mouse. My Dachshund was in the coop with me a few weeks ago and was digging like crazy at the end of the ramp to their nesting boxes and a teeny mouse baby jumped out and ran out of the coop. Well it ran back in the pen in the front where all the Barred Rocks were standing but they just stood there watching it in awe so I had no idea they would learn to eat them. That mouse got away so maybe now that they have been introduced to them they wont miss another one. I know they did major snatch and grab, honk and beep and sqwack saturday over the biggest fattest grub worm I have ever seen! Guess he was yummy! My dog loves them too so I knew that wouldn't harm them, japanses beetle larvae, we have alot of those in NC. Thanks for the mouse info, helpful! Darlene