Where the per-person figure comes from
National slaughter statistics divided by population give a per-capita number of animals killed for food each year. In high-income countries this lands at roughly 25–30 land animals per person annually, dominated overwhelmingly by chickens: a single person eating an average Western diet accounts for around 23–25 birds, one to two pigs every few years, and a fraction of a cow. Fish and other aquatic animals are counted separately and are far larger in number, which is why they are shown as their own line rather than folded into the total.
