A cleverly thought the case, but unfortunately does not work on rats, for which we had originally planned. The case stands for weeks in our garden, expertly prepared, with proper bait, and the only thing that has been tapped into it, are two little mice. Rats not move the case on, this is probably the passage too narrow and the structure too daunting in the active Lung on adult rats, and if a mouse into pats, it's not easy to get it back out, one had so unfavorable hidden behind the door, that we are well and happy needed 30 minutes to release it again. We would be the case do not buy again - great idea but poor in implementation. For rats definitely too small - perhaps a larger built model would be effective. Urgent need of improvement!