SP Myers 1974 Pseudoleistus viridescens Tower Llamos, Estancia Medeland, 35 Km S. of Tandil by road, Pto de Wadariaga, Pcia de Buenos Aires, Argentina 18 January picking up Pseudoleistus v. on grid 4. Their feeding behavior is much more deliberate than that of Tryngites. P.v. is slower, more methodical it would seem - turning over cow pies, shoving their bill under, working around the beans. When they concentrate on very small area working them over thoroughly (it would appear). Note that P.v. a swallow cowpie user. 16 January mid afternoon - while running grid in Arroyo saw huge (100's? - 1000) flocks of Pseudoleistus whirling over fields. Not seen anything as large as this to date. - their flocks were previously of a different magnitude - 30-40 birds at most — see map, journal, 8-23-74 (16 January, Estancia Medeland, 35 Km S. of Tandil by road, Pto de Wadariaga, Pcia de Bs. Aires, Argentina) 10 September loose flock of Pseudoleistus - foraging near buffy-golden-Gracopholus - Emileyx flocks. ~30 individuals, spread out as a front across >50 m of land. One of these is running from cowpie to cowpie, inserting its bill beneath, forcing them up whence, and eating whatever lay beneath. Of course, this works only with old and dried cp's. Movement between forage sites is interesting: first they walk, waggling in the process for the first 1/3-1/2 of the distance, then they begin to hop, which increases their speed. Sometimes this hopping develops into flying, particularly if the individual has fallen behind the main center of the others. Other foraging sites typically are bunches of grassland open field 15 September more cow-pie toppling by Pseudoleistus individuals. Today accompanied by Molothrus bonariensis — (see cowpie accent)