J.P. Myers 1974 Thinocorus rumicivorus 11 April (contd) Tower Clanos, Estancia Medeland, 35 Km S. of Juancho by road, Pto de Madariaga, Pcia de Bs As, Argentina thistle patch, settling down. They scratch their heads under the wing, unlike Charadrius. 2005 - returning from llanos found the usual small group of thinocorus in the track across the fallow corn field; they were roosting. I find it interesting that thin appears to roost on its feeding sites in small flocks, rather than refuging to some central roost. This makes similar, but perhaps a more extreme example, of what I find for Tryngite + Pluvialis dominicae. 26 April 1620 I took micro-plotting habitat data from Thinocorus by the E edge of the thistle patch on the llanos. Earlier had watched a flock of 17 thin. out air shortgrass near the gate moving as a very light unit, near + within a mixed flock of Zenaida and Oreophasis. Despite MAE Rumboll's belief that they are 2 spp of Thinocorus here, I have been able to ID only one, rumicivorus. There are not two obvious age classes of seedeater, nor are there any 87 grey-backed, which would be obvious. 9 June 3 @ Thinocorus r - flying over, calling (see camp list) Estancia Medeland, 35 km S. of Juancho by road, Pto de Madariaga, Pcia de Bs As, Argentina 23 August a few Thinocorus spooked by the gate to Tower Clanos. Several large, very light flocks flying during mid morning over Tower Clanos and points along the Arroyo further north. appears somewhat unusual - they used to be seen only when spooked. Now I see more in the air than on the ground. 30 August a small flock of Thinocorus on the plowed field near the arroyo (8/12) on 8-23 map Here are not the first seen since 23 August, (that is as I usually see several flocks of 50+ in Tower Clanos or similar habitat or the Estancia). But flock numbers are declining. I have not seen over 100/day since arriving. (8/12) Estancia Medeland, 35 km S. of Juancho by road, Pto de Madariaga, Pcia de Bs As, 10 September saw flight 5 Thinocorus at 1830 - first saw for several days. 11 September collected 87 Thinocorus, a few hundred m E of last night's sitting today at 1130 (actually seen at 9.11). 2 nearby. 2 flying in air at 1134 at same site calling in a more elaborate way than their usual flight-call.