Pup catchers are little nets that you can put below a bat house just in case a pup (baby bat) loses its grip and tumbles out. According to our expert partner, Merlin Tuttle, pup catchers are only necessary for bat houses that aren’t built correctly, which unfortunately is many that are sold on the market. BatBnBs are made with proper machine cut grooves for excellent gripping, so the pups shouldn’t fall out. The other downside of installing a pup catcher is that it can serve as a perch for predators. So as long as you have a BatBnB and not a lower quality bat house, your pups should be safe and sound!