increases in predation risk.

Hydrocephalus

Exceptional cases of hydrocephalus, such as that reported by John Lorber in 1980 and by a study with rats, suggest that relatively high levels of intelligence and relatively normal functioning are possible even with very small brains. It is unclear what conclusions to draw from such reports - such as about brain capacities, redundancies, mechanics and size requirements.

Biogeographic variation

Efforts

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