Simon shows you maps - Brain size vs body weight of various animals. We humans (I assume you aren't a water opossum) are a positive outlier. So are foxes, apes, and dolphins.
Why is intelligence correlated with the ratio brain/body size? It logically takes the same number of brain cells to solve an equation regardless of body size. Bodies of e.g. mammals of different
1. Relation between brain volume and body weight for some species of... | Download Scientific Diagram
![Brain-mass to body-mass ratio. Plot of the relationship between brain... | Download Scientific Diagram Brain-mass to body-mass ratio. Plot of the relationship between brain... | Download Scientific Diagram](https://www.researchgate.net/publication/286856709/figure/fig2/AS:354724726493187@1461584373852/Brain-mass-to-body-mass-ratio-Plot-of-the-relationship-between-brain-mass-in-g-and.png)
Brain-mass to body-mass ratio. Plot of the relationship between brain... | Download Scientific Diagram
![The relation between the ratio of brain mass/body surface area and body... | Download Scientific Diagram The relation between the ratio of brain mass/body surface area and body... | Download Scientific Diagram](https://www.researchgate.net/publication/24198371/figure/fig2/AS:216457918062593@1428618997340/The-relation-between-the-ratio-of-brain-mass-body-surface-area-and-body-surface-area-in.png)
The relation between the ratio of brain mass/body surface area and body... | Download Scientific Diagram
![Brain-mass to body-mass ratio. Plot of the relationship between brain... | Download Scientific Diagram Brain-mass to body-mass ratio. Plot of the relationship between brain... | Download Scientific Diagram](https://www.researchgate.net/profile/Victor-Borrell/publication/286856709/figure/fig2/AS:354724726493187@1461584373852/Brain-mass-to-body-mass-ratio-Plot-of-the-relationship-between-brain-mass-in-g-and_Q320.jpg)
Brain-mass to body-mass ratio. Plot of the relationship between brain... | Download Scientific Diagram
![The domesticated brain: genetics of brain mass and brain structure in an avian species | Scientific Reports The domesticated brain: genetics of brain mass and brain structure in an avian species | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fsrep34031/MediaObjects/41598_2016_Article_BFsrep34031_Fig1_HTML.jpg)