Dodo Neuroanatomy & Nocturnal Niche Simulator

Empirical micro-CT endocast allometry and sensory paleobiology of Raphus cucullatus

Columbidae Allometry: α = 0.67

1. Cranial Endocast Anatomical Explorer Raphus cucullatus (Mauritian Dodo)

Brain Mass

8.9 g

Body Mass

10.2 kg

Enceph. Quotient (EQ)

0.94

Olfactory Ratio

2.8% (+38%)

Neuroanatomical Finding: Endocast volumes scaled accurately to Columbidae allometric expectations (EQ 0.94). Olfactory bulbs are markedly enlarged compared to diurnal columbids, indicating specialized nocturnal olfaction.

2. Columbidae Brain-to-Body Mass Allometry log(Brain) vs log(Body)

Allometric Slope (α)

0.67

Dodo Residual

-0.03 (Normal)

Optic Tectum Angle

41.5°

Cornea:Orbit Ratio

0.42 (Mesopic)

*Standard Columbidae regression line y = 0.67x + 0.32. The dodo lies squarely on the pigeon neuro-scaling curve, directly disproving cognitive hypoplasia.

3. Prehistoric Mauritian Canopy Nocturnal Foraging Simulation Foraging Yield: 91.5%

Ambient Canopy Lux (Light Level) 0.05 lux (Overcast Moonlight)

Tracking Modality:

Calvaria major Drupe Hits

18 / 20

Olfactory Signal / Noise

14.2 dB

Scotopic Sensitivity

0.76 Index

In dense ancient Mauritian rainforests, light under the canopy often fell below 0.05 lux. Flightless dodos located fallen, fermenting Calvaria major tree fruits using heightened olfaction rather than daylight vision.

4. Historical Caricature (1598) vs. Micro-CT Paleoneurology

Feature / Observation	Historical Dutch Sailor Accounts (1598–1681)	Empirical Micro-CT & Bone Histology Evidence
Cognitive Capacity	"Dumb & Sluggish" — Walked directly up to hunters with zero flight response.	Normal EQ (0.94) — Brain volume proportionally identical to modern pigeons; naive to terrestrial mammalian predators due to island isolation.
Daytime Inactivity	"Lazy / Torpid" — Frequently observed roosting and sedentary in daylight.	Crepuscular / Nocturnal — Expanded olfactory bulb (+38%) and large scleral rings optimized for nocturnal ground foraging.
Olfactory Bulb Complex	Ignored — Avian species presumed anosmic.	Hypertrophied (2.8% volume) — Crucial sensory specialization for tracking fallen forest fruits on the pitch-black forest floor.