A pocket guide to how big living things are, from tiny molecules to huge colonies. Below are answers to the questions people ask us most.
Living things vary a lot. Each entry shows a typical size, and a few show an upper value instead. Sizes for prehistoric species are estimates. Open an entry to see exactly what was measured and where the figure comes from.
Use the units switch in the app to pick metric or imperial. Entries, comparisons and quiz questions all follow your choice.
No. All 50 entries are inside the app, so it works offline, and there is nothing to sign up for. Your settings stay on your device.
Write to cordelia@mulleintrestle.info and tell us which device you use. We usually reply within a few days.
How we treat your information: privacy policy.