Caracara plancus (Falconidae) is a diurnal raptor bird, described as an opportunist that feeds on carrion and a variety of live preys, including rodents. Based on the skeletal remains of rodents recovered from pellets produced by this bird, an analysis of the modifications occurred on those bones was carried out, concluding that they were important. Along with pellets, scattered rodents prey remains not digested, collected in the same sampling area, under the roosting, were analyzed. The comparison of the data from pellets and that from uneaten prey remains indicates that southern caracara would perform a certain selection over different body parts of predated rodents, discarding mainly the cranial regions. The ingested osseous remains, showing evidence of breakage and digestion, could accumulate together with the skeletal elements that, which constitute the remains of prey, with particular signs of breakage but without signs of digestion. These findings are particularly relevant in order to avoid missininterpretations of this kind of accumulations, which are not mixtures produced by several predators but only one predator with a particular pattern of ingestion. Consequently, when zooarchaeological or paleontological records from the Pampean region are analyzed, it is very important to consider the fact that these birds of prey could have contributed to the accumulation of micromammal bones, with skeletal elements coming both from pellets and prey remains.