The map of which species have spread viruses to other animals is awesome. Also, the restraint in only including 5 data graphics (two of which are illustrations

The map of which species have spread viruses to other animals is awesome. Also, the restraint in only including 5 data graphics (two of which are illustrations for comparing size, which is as natural as you can get) is commendable. Graphics can be easier to understand than numbers in text, but text is easier to skim while reading. The only nitpick I'd have is the use of log scale for the body mass to longevity chart. It spreads out the data points, but complicates comparisons. And log scales aren't well understood by most people who don't make charts for a living.