SP Myers 1973 Calidris melanotos Grid 1 (farmhouse Puddle) Salamia Medland, 35 Km S of Tavacho by road, Pucia de Buenoitere, Argentina 24 December cont'd 0745 Pedocal in (3,3) just chased (4,3) bird, which flew left bank a bit further away in (4,3). Also (1,1) Piedford chasing another bird out of (1,1) into (3,2) 0805 ped in (0,5) & (0,2) with ~ 5 m between them. Both feeding. 0817 - watching bird ceased, then chased (0,1) away by flying to it in (0,1). Just flew at him + churned. As is frequently the case, it seemed to me that the birds just were hanging low when he flew in supplantation. It was a "helicopter" flight, + the feet are quite prominent. 0905 - as far as I can tell the Pedocal with the 4,2 stake as an activity center has a territory extending to the middle of the (3,1) block, to part the (4,4), to (4,0) and to (5,1)-(5,2). 0910 he supplanted a bird in (3,1) in lower left hand corner - he chased it & as I watched the bird went part (3,1) grid units 5 x 5 m Total grid 25 x 30 m 26 December 0620 taking following data on Pedocal. Near Stake (4,2) attacked a Pedocal intruder bird that had wandered over from (4,3) unit. The attacker had been preening on our site for 5 minutes when he went after the intruder. The chase included 11 successive appulanta- tions, ranging from (4,3) → (4,0) → (0,0) → (4,3) → (4,0) → (4,8) → (9,3). I was able to record the site of aggression fairly accurately on a grid map, and calculate the distance to be on the order of 95 m in less than 1 minute. The distances were all flying, except for the first approach. The final interaction brought the (0,4) area Pedocal down. The bird that has been being chased left the grid, and the (0,4) chased the chosen back toward (3,2). The overall shape of the territory of this bird (the 4,2) is similar to that of the bird described in the last 12/24 entry. 0635 (second sheet on site of aggression) - began 0635 with a Pedocal supplanting another in (4,3). This aggressive bird followed his object for some distance (12m) landing in (4,3) where it (the chaser) was chased by a another Pedocal from that region. came from (0,4)