Setup
install.packages(c('dplyr', 'ggplot2', 'readr'))
download.file("https://ndownloader.figshare.com/files/2292172",
"surveys.csv")
download.file("https://ndownloader.figshare.com/files/3299474",
"plots.csv")
download.file("https://ndownloader.figshare.com/files/3299483",
"species.csv")
download.file("https://datacarpentry.org/semester-biology/data/mammal-size-data-clean.tsv",
"mammal-size-data-clean.tsv")