In the stationary radar experiment 1A, we found that cowbirds scanned less and moved more during radar exposure at the experiment-wide scale, but this effect was not reversed after radar exposure. In experiment 1B, we also observed an increase in movement rate, this time at the 1-minute scale at radar onset. Birds may have been moving within the enclosure to avoid the microwaves as the antenna scanned the enclosure. This finding is similar to that of Wasserman et al. (1984a), where blue jays avoided portions of enclosures with microwaves. However, this result cannot explain the continuation of higher movement rates in the period after radar exposure. A decrease in vigilance behavior could have been caused by habituation to the enclosure after the first 2 min (see Fernández-Juricic et al., 2013). Factors other than radar exposure, such as food depletion after the first couple of minutes could also have led to increased movement rates as birds searched in the enclosure for food (Stephens and Krebs 1986). However, no bird consumed more than 25% of the food provided in each trial. We also found that peck rate decreased with body mass, similar to previous studies (e.g.; Lewis and Dougherty, 1992 and Fernández-Juricic and Beauchamp, 2008).