JPL Myers 1934 Vanellus chilensis 02 (018) region Catania (Medaland), 35 Km S. of Juanchu by road, Pteo de Madariaga, Hacia de Bs Aires, Argentina 15 September 1000 Vanellus chasing Tryngite, Pluvialis and Oreopholus. The flight of a chasing Vanellus is quite distinct. The bird is obviously pursuing — obvious because of the deep thrush of the wing, the lawness of the flight to the ground, reminiscent of jager going after terns, and as the lapwing reaches its victim it swoops — typically going down a little to a [illegible] nadir at the pt. where the offender is, and then rising sharply — flapping — [illegible] — and turning. Lapwings also dive bomb after lapwings using a similar flight. 1018 — possible incubating Vanellus 125 m E. of car in (2,19). Very low profile, sitting still. Black breast patch only partially visible. 1025 — curious going on which I cannot see well because of the local topography. Vanellus display involving 2 birds, one "stretch-wing comfort movement" [illegible] 30° angle 2 in 3 minutes, the other only partially visible, 1.5–2 m from the other, leaning over forward and tremor moving its feet up and down rapidly. All that I can see is the rapid leg motion + the general body fit. Repeated several times. The other Vanellus walked away. 1032 incubating Vanellus off and away. Another Vanellus approaching site (may be same bird). Settling down — definitely incubating. 1105 Vanellus breeding dispersion not at all clear. If nothing else, it is extremely dense. There or another incubating individual less than 100 m to the E. And each of those individuals appears to have a 'mate'. And on all sides of them there are more other pairs of Vanellus. Individuals appear to approach to within ≤50 m of nest without interference. Extensive banding necessary to evaluate, perhaps 2 generations. 1100. 1108 — a Vanellus landed amidst a flock of bufflfs when I have been watching the latter, no aggression. 1120 4 Vanellus "lapwings" near 1st nest seen, but none are of that pair! 3 other Vanellus within 100 m, as well. The density of Vanellus here! See this am census in journal. Does appear that the 'pair' is consistent about chasing other Vanellus out of 50 m diameter hollow along the edge of which lies the nest. Elaborate display see Nest account. 17 September 0649 — Vanellus beginning to close shoulders. See bufflio spaccent 1935 (Vanellus tapping its foot!), going between feeding sites as usual — slow walk — stopping, then tapping its foot in a slow rhythmic fashion — 1–2/sec and 2–5/stop.