Should my Bird Houses have a Perch?

I’m building my own bird houses. Do I or do I not put perches at the entrance? –Mesick, Michigan

I don’t recommend perches on bird houses. Natural cavities such as tree trunks do not have perches, so birds that use nest boxes don't need a perch either. A perch might also invite predators or other birds to attack or bother the parents and babies inside.