This paper synthesises footprint data from nine naturally sealed caves documented in Pastoors and Lenssen-Erz (2021), supplemented by five post-publication studies. The footprint record shows that cave visitors frequently comprised multi-generational groups including small children, with direct evidence of child play at multiple sites. Behavioural patterns are consistent across caves spanning from the Aurignacian through the Mesolithic: small groups, children present in deep zones, spatially structured activity, and rare visitation. At the three sites with high-confidence recording windows, between one and four visits are documented across periods ranging from 700 to 15,000 years. A preservation asymmetry is identified: footprints survive preferentially in deep, undisturbed zones where transient and exploratory activity occurred, while zones of sustained occupation tend to destroy footprint evidence. The dataset spans periods with markedly different demographic conditions, from the Aurignacian when the entire European metapopulation may have numbered in the low thousands through the Late Glacial population expansion, yet the behavioural patterns remain consistent throughout.

This paper documents two typological phenomena and explores their possible connections. Track A: the grammaticalization of "head" nouns into reflexive pronouns (HEAD→SELF) clusters in the Caucasus at rates above the cross-linguistic background. A Bayesian generalized linear mixed model (brms with rstan backend; Bernoulli family; formula: bpdr ~ caucasus + lat_c + lon_c + (1|family); weakly informative priors; 4 chains × 2,000 draws) yields a Caucasus effect of OR = 10.30 (95% credible interval [1.82, 55.86]; 99.4% of posterior mass positive), based on 2,463 languages across 216 families from Grambank. The family-level Fisher exact test (4/7 Caucasus families vs. 27/196 globally) yields OR = 9.62, p = 0.0076. The same grammaticalization pathway is widespread across Afro-Asiatic, attested with independent lexical roots in five of six branches. Track B: Great Andamanese and Kusunda — both isolates in geographic refugia — share a structurally parallel body-zone noun classification architecture not attested in any other documented language family. A peer-reviewed reconstruction of Proto-Kusunda (Spendley 2024) independently identifies the parallel, describing the Kusunda system as "strongly reminiscent" of the GA morphology. The paper proposes an elaboration model in which body-zone classification may represent the full development of the HEAD→SELF tendency under conditions of extended small-population isolation, and explores a substrate/dispersal interpretation as a hypothesis for future testing. All quantitative analyses independently verified in R Core 4.3.2 (base R stats package). Seven supplementary data tables provide the full dataset for independent replication.

This survey applies a three-evidence framework — fresh tissue studies, fossil endocasts, and contextual fossil remains — to seven lineages where derived cortical organization has been documented: papionin cercopithecids, small-brained hominins (Homo naledi, Paranthropus, Homo floresiensis), corvids, parrots, beavers, toothed whales, and raccoons. These lineages span different brain architectures and scales, from the 8-gram brain of a crow to the 1800-gram brain of a bottlenose dolphin. For each lineage, the survey documents what specific brain regions shifted, what direct behaviors are associated with those shifts, and what sophisticated capabilities emerged that build on the initial neural investment. A recurring pattern emerges: initial cortical specialization for one function creates infrastructure that subsequently supports more complex behaviors serving different purposes — motor face cortex expands for lip-flip displays and later scaffolds complex vocalization; somatosensory cortex magnifies forepaw representation for foraging and later supports ecosystem-scale construction. Recent quantitative work by Hubbe and Harvati (2026), testing six evolutionary models against cranial morphological data from 63 fossil and 24 recent Homo crania, found that encephalization proceeded via neutral drift rather than directional selection — reinforcing that the interesting evolutionary action was always at the organizational level, which is the level this survey examines.

This paper presents a comparative framework documenting modular cortical reorganization across three independent primate lineages — papionins, capuchins, and Paranthropus — that achieved sophisticated cognitive capabilities within small brain size constraints. Drawing on the parameters-of-derived-cortical-organization analysis and integrating Hubbe and Harvati's (2026) morphometric data on Paranthropus cranial variation, we demonstrate that cortical reorganization rather than volumetric expansion is the primary mechanism for cognitive advancement in these lineages. The papionin-capuchin-Paranthropus convergence framework reveals that modular reorganization of existing cortical territory, particularly expansion of prefrontal and temporal association areas at the expense of primary sensory cortex, occurs independently when ecological pressures favor enhanced social cognition and extractive foraging. We propose that the VI trajectory logic — validated across the broader integration-depth framework — predicts which cortical modules will be reorganized based on the functional integration depth of existing neural circuits. This work establishes a comparative research program for studying convergent cognitive evolution under brain-size constraints, with implications for understanding hominin cognitive diversity beyond the genus Homo.

Captive breeding programs assume that fitness decline under domestication selection proceeds at a roughly constant rate per generation, allowing managers to estimate safe captive durations. Reanalysis of Araki et al.'s (2007, 2009) steelhead trout (Oncorhynchus mykiss) data reveals that the decline accelerates: per-generation wild-fitness loss increases from 20% (G0→G1) to 54% (G1→G2), a 2.7× rate increase. This acceleration is predicted by Christie et al.'s (2012) finding that captive fitness and wild fitness are negatively correlated — alleles favored in captivity actively degrade wild performance. Each generation's adaptation to captive conditions deepens the mismatch with the wild environment, producing a positive feedback loop: domestication selection is autocatalytic. Inbreeding accounts for only 1–4% of the observed decline (Christie et al., 2012), ruling out genetic drift as the primary mechanism. The Biggins et al. (1998) black-footed ferret data provide an independent demonstration that niche provision depth — not genetics — drives the fitness cost: cage-reared and pen-reared ferrets from the same breeding program show 2% vs. 20% post-release survival, a 10-fold difference with genetics controlled. These findings suggest that conservation breeding protocols should minimize niche provision (enriched semi-natural rearing rather than sterile captive environments) and should plan for accelerating, not constant, fitness decline per captive generation.