We have done preliminary research on insects living in Eastern Bluebird (Sialia sialis) next boxes in the southeastern U.S.A. (see associated conference poster and published abstract on ResearchGate). Our findings indicate habitual use of these next boxes by particular groups of beetles that are not apparently parasitic on the birds, but co-inhabit the next cavities. Surprisingly little has been published on this general topic, which seems to be an underestimated and understudied type of animal interaction. Please share any information you have, published or unpublished, on this general topic.
Data Conn with Conn et al 2004 Insect Utilization of Bluebird Nes...
Article Utilization of bluebird nest boxes by insects at diverse sit...