. . . . "BIRDBASE v2025.1 was downloaded from figshare (6,683,628 bytes) and the Data sheet was read. Crooked-talon birds are rows whose Order is Accipitriformes, Falconiformes, Strigiformes or Cathartiformes. A row is scored when at least one of Social_1 through Social_6 is non-blank. It is gregarious when Social_1 or Social_2 is 1, the legend's colonial and flock codes. Pairs, solitary and lekking alone are not gregarious. The numerator is gregarious scored species; the denominator is scored crooked-talon species." . . "Measured: 42 gregarious crooked-talon species (n = 165). Interpretation: Aristotle's crooked-talon birds are the birds of prey he elsewhere calls crooked-clawed (eagles, hawks, falcons, vultures, owls). Mapping them to the four modern orders is an operationalization of that class, stated before the social-system counts are read. A diet guild is not that class. Gregarious is contrasted in the same lines with solitary, and the examples are flocking birds, so a breeding pair is not a flock." . "Claim test of aristotle-ha01-04: refutes, confidence 0.78" . . . "A public species-level table from AVONET or another listed source (AnAge, FishBase, PanTHERIA, GBIF, NCBI, WoRMS, PBDB) or a checksummed paper supplement, with avian order or an explicit crooked-talon flag, and a social-system, coloniality or typical group-size field. Licence stated. A foraging niche is not admissible as either variable." . "claim-test/0.1.0" . "biological" . "One or more of those species is flocking, colonial, or has a typical group size of at least 3. A missing social-system column does not disconfirm the universal." . "42 of 165 scored crooked-talon species are coded colonial (Social_1) or flocking (Social_2). The universal fails. Examples include Cathartes aura, Gyps africanus, Gyps bengalensis, Aegypius monachus, Pandion haliaetus and Elanoides forficatus. The full list is in derived/crooked-talon-social.csv." . "424 of 589 raptor rows have no social code, so they are outside the denominator. Missing codes do not cancel a scored flocking species." . "Orders are the operational class for crooked talons. The table has no talon-curvature measurement. Codes are compiled from handbooks, not one field protocol." . "Social_2's legend is 'large numbers of birds, mixed species flocks, seasonal flocks'. That is the passage's gregarious (pigeon, crane, swan), not a breeding pair. Lekking alone was not counted." . "Zero of the crooked-talon species with a non-missing flocking or group-size score are gregarious, out of a denominator of at least 40 such species." . "Pre-registered. The universal is refuted if that count is at least 1 and the denominator is at least 40. If the denominator is under 40, inconclusive (underpowered). If there is no flocking, coloniality or group-size column, or crooked-talon species cannot be identified from order or from an explicit talon flag, inconclusive with reason data-unavailable. Trophic niche, diet, primary lifestyle, hand-wing index and body mass are nearby columns and are not used as flocking or as talon shape." . "0.78"^^ . . "refutes" . "If no bird with crooked talons is gregarious, then in a species table every crooked-talon species with a flocking score will be solitary or in pairs, and none will be flocking or colonial." . "Denominator is the number of crooked-talon species with a non-missing gregariousness score. The numerator is how many of them meet the pre-registered gregarious rule. Support only if the numerator is 0 and the denominator is at least 40. Any positive numerator at that denominator refutes the universal. Below 40 is underpowered. No such column is data-unavailable." . "Pre-registered. Quote: 'no bird furnished with crooked talons is gregarious.' In the same passage the gregarious birds named are the pigeon, the crane and the swan, so gregarious means living in a flock, not merely a mated pair. Crooked-talon birds are the raptors: orders Accipitriformes, Falconiformes, Strigiformes and Cathartiformes in the table's taxonomy. If the table has a talon or claw curvature measurement and no orders, curvature is not invented; the clause is then data-unavailable unless the table itself flags crooked talons. Gregarious is a column of social system, flocking, coloniality, or typical group size. Group size >= 3, or a value gregarious, flocking, colonial, or 'sometimes flocks', counts as gregarious. Solitary, pair and territorial pair do not. The claim passes only if the count of gregarious crooked-talon species is 0 and the denominator (crooked-talon species with a non-missing score) is at least 40." . "false"^^ . . "Species-level social codes and order, used as flocking and crooked-talon class" . "CC BY" . . "Dataset: BIRDBASE v2025.1, a global avian trait table (Sekercioglu et al.)" . . . . "sha256:cccb01fe229c7b39156639e001098b29880fa1c91d294c17cb74a4a76381276b" . "sha256:f3c0099343eb85f7a83d1aaa247ec88933e27b58426bab4fbb051616173a6a2c" . . "delphisci claim tester (grok-4.7; cursor/aristotle-life-history-i-b0f1)" . . . "grok-4.7" . . . . . . . . . "2026-11-08T16:24:31.746Z"^^ . . . . . "Claim test of aristotle-ha01-04: refutes, confidence 0.78" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . 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