Nicely written and fun to read, however: Just referring from an article to a discussion thread is not what i expect. An article should summarize the content of the discussion threat to make it accessible faster and more convenient for the reader. If i had a problem with mice in my duck-house, i would not like to read through 13 pages of thread and note down the collected experiences and recommendations of fellow poultry keepers. - Even though the first answer is just hillarious! Well done @eggchel.
If a mouse can fit it's head through a gap the rest will follow. Thats smaller than 1 inch. A snapdragon is a great way to catch and kill them. Just keep them covered and away from your animals!