Social isolation has been recognized as a major risk factor for morbidity and mortality in
humans for more than a quarter century. The brain is the key organ of social connections …

Across the animal kingdom, we see remarkable variation in brain size. This variation has
even increased over evolutionary time. Traditionally, studies aiming to explain brain size …

Relative brain size has long been considered a reflection of cognitive capacities and has
played a fundamental role in develo** core theories in the life sciences. Yet, the notion …

Despite considerable interest in the forces sha** the relationship between brain size and
cognitive abilities, it remains controversial whether larger-brained animals are, indeed …

Comparative biologists often attempt to draw inferences about tempo and mode in evolution
by comparing the fit of evolutionary models to phylogenetic comparative data consisting of a …

According to current evidence, Homo sapiens was unable to survive on a diet of raw wild
foods. Because cooked diets have large physiological and behavioral consequences, a …

The allometric relationship between brain and body size among vertebrates is often
considered a manifestation of evolutionary constraints. However, birds and mammals have …

The domestic cat is the only member of the Felidae to form social relationships with humans,
and also, the only small felid to form intraspecific social groups when free ranging. The latter …

Highlights•'Social complexity'is widely used but poorly measured.•We describe two common
flaws with measures of social complexity.•We propose a new definition that is both objective …

Cooperative hunting is believed to have important implications for the evolution of sociality
and advanced cognitive abilities. Variation in the level of hunt organisation amongst species …