Idea List Hutching success w/ group size, too. "attentiveness data" 1 Hatchling success, groups w/ acorns vs groups w/o acorns. if plenty of acorns, birds need to spend less time foraging (Flycatching) can be more attentive 18 Feb 1990 @2 As per Petes suggestion, quantify how frequently birds are together. Independence a problem. eg e.g. Can either 1 when arriving at a territory see whos there and who within 10 meters or so of each other (also 5 meters). If disturbance a problem, point sample 1 hour later or so. Each bird will have a p of being in the granary (or in view) or in whatever tree you're watching. A 4 bird group: probability of all together the product of the separate probabilities, or find one bird (first bird you find) (its p = 1). Then look for other birds. What are the ps of others nearby. The question is: Do wickers stay close together on the territory, or are they not much more likely than chance to be found together? If they do, who stays close to who? Territory defense (Intraspecific) 1 2 3 @ 5 Date Time group defender chasee (intruder) Territory defense (Interspecific) 1 Date Time group defender intruder