Hutto RL, Hutto RR. Does the presence of an observer affect a bird's occurrence rate or singing rate during a point count?.  2020. Available at: http://doi.wiley.com/10.1111/jofo.12329.

Mischler SK, Karlin EJ, MacDougall-Shackleton SA. Call production induces motor-driven ZENK response in the song control system of black-capped chickadees. Animal Behaviour. 2020;163:145 - 153. Available at: https://linkinghub.elsevier.com/retrieve/pii/S000334722030066X.

Congdon JV. Perception and communication of predator threat in the black-capped chickadee (Poecile atricapillus). Department of Psychology. 2019;PhD.