Each basic type of nest built by passerines has advantages and disadvantages in specific ecological situations, and nest type depends on a balance of multiple ...
Predicting Flock Vigilance from Simple Passerine Interactions: Modelling with Cellular Automata. David B. Bahr. University of Colorado. Marc Bekoff.
Density and occurrence of shrub-steppe passerines are often related to key habitat characteristics such as plant species composition, cover, and structure.