Vagrancy of Neotropical Cormorant, Egrets, and White-Faced Ibis

Variable Seasonal Movement Dynamics among Individual Snail Kites (Rostrhamus sociabilis) in South America

“…All Snail Kites were adults (i.e., at least 1 yr old), except #78, whose age we were not able to determine. Olrog 1975), and Coscoroba Swan (Coscoroba coscoroba; Calabuig et al 2010), raising the possibility of even more widespread movements in this region by large numbers of wetland species. Because Snail Kites feed almost exclusively on snails, movements of Snail Kites throughout the year likely track environmental conditions that maximize access to their primary food source.…”

Full Issue

“…Those breeding in Utah are well documented to winter as far south as western, central and eastern Mexico (Ryder 1967). Furthermore, in South America, movements of up to 1,800 km have been documented between northern Argentina and southern Brazil (Olrog 1975), while the species has wandered as far south as Tierra del Fuego (Hancock et al 1992) and perhaps even north-west to southern coastal Peru (Hughes 1970). In North America, prebreeding wandering appears to be more prevalent than in the post-breeding season (Ryder 1967, making the timing of the Cuban record documented here less surprising.…”

Seasonal and geographical variation in resident waterbird populations along the Paraguay River

“…Waterbirdsof many species are a conspicuous component of wetlands throughout South America. Rowever, relatively 1ittle is known about their abundance and seasonal movements in many areas,especially in freshwater wetlands in the interior of the continent (e.g., Olrog 1974, 1975, Antas 1983, 1994. Because of the accelerating rate of environmental degradation of wetlands in central South America (Alho el al.…”