Strnad, M., Nemec, M., Vesely, P. and Fuchs, R. 2012. Red-backed Shrikes (Lanius collurio) adjust the mobbing intensity, but not mobbing frequency, by assessing the potential threat to themselves from different predators . Ornis Fennica. 89, 3 (Sep. 2012), 206–215. DOI:https://doi.org/10.51812/of.133807.