Sexing Monochromatic Birds in the Field: Cryptic Sexual Size Dimorphism in Buff-breasted Wrens (thryothorus Leucotis)
Why this work is in the frame
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Bibliographic record
Abstract
Working in the Neotropics poses special challenges for those interested in sexing resident bird species. Many species are monochromatic and apparently monomorphic, and both sexes may sing and defend territories. We tested whether monochromatic Buff-breasted Wrens (Thryothorus leucotis) could be reliably sexed using simple body size measurements. We compared the size of known males and females using paired t-tests and logistic regression analysis (LRA). At the level of the population, the sexes over- lapped in all mensural characteristics; however, on average males were larger than females. When consider- ing individual pairs, males were significantly larger and heavier than their mates. The best model from LRA indicated that measurement of wing chord alone was sufficient to discriminate between males and females, with 95.5% of individuals correctly classified. Three individuals were incorrectly classified by LRA (two males and one female), but could be sexed by comparing them with their mates, as the males were larger
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it