David mentored the first author, a UBC undergraduate, on this project that used remote field recordings near an urban roost in Vancouver to estimate roost departure time. They found that northwestern crows seemed to maintain a semi-natural circadian rhythm in their roost departures, even with strong variation between days in the timing of anthropogenic noise due to automobile traffic.
Khadraoui, M. and D. P. L. Toews (2015) The influence of environmental cues and anthropogenic activity on roost departure times in the Northwestern Crow (Corvus caurinus). The Wilson Journal of Ornithology, in press.