J.P. Myers 1979 Tryngites subroficollis Tower Llanos, Estancia Medland, 35 Km S. of Juancho by road, Ptdo de Maduranga, Provincia de Buenos Aires, Argentina 18 January (cont'd) buffle "burble" sound which I have begun to hear recently. After a brief tangle the two entered a classic calidridae crouch - back feathers raised, neck outstretched + held low (alternated) or preening). The attacked bird began working away - pecking, 45° angle flying from A' + combining a crouch. A' making a second approach (i.e. second attack). Now both are working on cowpips, feeding. But then in ~20 sec A' struck crowding again + then the fight began anew - hopping, wings are out, jabbing, fencing up bill. Hopping at one another. B' initiated this bout. Much vocalizing behind the burble (trill). More hopping - most by A', with B' jabbing from a crouch toward the foot of A'. The whole interaction has taken place over a 10 m radius area. In the attack the wings were held outstretched + fluttered especially during jumping behavior. Lois watching buffle on a ravine side (S) of drainage area from tower - she picked it up while it was working in the dirt at the base of the "cliff." It waded up cowpith who lones them, + has been foraging along the edge since 0700 (time now 0745). The bird walks repeatedly back and forth along the ledge, picking food off of the overhanging grasses (on ledge) + beside. In 45 minutes it has retraced same route 6-7 times, moved the team slowly. Twice it has in flight "pattered" the area (the limits of which appear to be well defined - 50 m wide on either side of ledge, 100 m long. Both length + width are defined by both the birds foraging sites + areas of supplementation. It consistently removes other buffles (and WR inconsistently + Correndera Pipits!). Attacked other birds either on foot or in flight. On foot it runs, holding neck stiff without actually touching it - but without the holding it low. Fast + directed run. In flight: will travel entire length of "transect" along ledge following WNR FLASH. - Flew landing within a foot of the intruder (seen twice). Also twice - flew across width, once to chase WR (stretch) neck very high prior to flight; flew + WR. Then returned to ledge, + repeated process to supplant a buffle. After all but one of the flights (4) it stopped to preen, preening different feathers very each time: 1) back+ wing; 2) breast; 3) breast; 4) tail. About 90% of time has been spent on ledge, with occasional forays down into drainage about 50 m away. Crouch seen: the ledge buffle flew 5 m