J.P. Myers 1974 Journal Estancia Medaland, 35 Kms. of Jvando by road, Pto de Madinaga, Pcia de Bs As, Argentina. 31 August (cont'd) in the surrounding short-grass uplands were sparse but present. Plowing of Towne Claro is almost complete. I pulled the stakes off Field 10 and 4 just before he plowed the under. Went as far north as (13,24). Shorebirds seen: Vanellus chilensis, Charadrius falklandicus, Zonibyx modestus, Oceopholus rufigilllis, Calidris baildii (collected one, 149), Calidris fuscicollis*, Calidris melanotos (collected one, 150), Himantopus himantopus. Returned to camp 1200. See appendices.* Species using recently plowed field: Vanellus, Zonibyx, Carro maculipennis, Cincloda fuscus, Pitangus sulphuratus, Anthus crenavera, Mole thrush. Observations of white-rumps and bairds today revealed no territoriality, indeed very little aggression (see appendices). I know that we have been using the (11,12) region of Arroyo Chico now for at least a week. Therefore either my hypothesis model of WR territory formation and hypotheses predicting their formation are wrong, or there is an limitation to be placed upon the turnover place of their appropriational. I suspect the latter in particular. I suspect that migratory behavior may conflict with the hypothesized tendency to limit one's foraging efforts in space. This is most simply conceived in terms of some phenomena related to migratory fluctuation → individual more more. Off on a wild rein → there must be an annual cycle in the amplitude of activity cycles, or perhaps in the probability to move. Actually, this is what I expected for territories not to develop until the population demonstrated some stability — but how much is necessary? And what role do the territorial individuals play in stabilizing the population? Anyway, if individuals move more, they will be less likely to engage in space-specific behavior. Perhaps migration entails an exaggerated increase in tendency to move plus compound control of movement (+annual seasonal variation therein). Whoopee. Another bit of speculation: given the action of weather + livestock on dead creeds — i.e., they are knocked down exposing existing extensive fields of short-grass physiogonomy — as the winter proceeds new areas for foraging shorebirds in the inland area must open up continuously. I September [illegible] day along Arroyo Chico. During the morning I drove at along Arroyo Chico to (15,26). Weather is quite similar to that we have been experiencing for several days now. -1°C at dawn, 0% clouds and a slight breeze. By 1000, a mild pick-up and clouds originated passively over from the south and southwest. Most of these are inconsequential — puffy cumulus whose shadow remains over me less than 3 or 4 minutes. Indeterminately, however, especially late morning →