3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
1,154
species
How to estimate it
Fermi’s official “Napkin math”
Start with the US. It stretches from the Arctic to the subtropics and hosts roughly 900 species. Canada adds arctic and boreal birds you don't see farther south, call it 100 more unique ones. Mexico's highlands and tropics bring another 150 that barely cross the border.
- US species
- ~900
- Canada adds (boreal, arctic)
- +100
- Mexico adds (highland, tropical)
- +150
- 900 + 100 + 150
- ~1,150
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- State of North America's Birds (2016)
- 1,154
- Native breeders + regular oceanic species
- US + Canada + Mexico combined
- = 1,154
Reference cited by Fermi: State of North America's Birds 2016 · Cornell Lab / ABC / Birds Canada / CEC
How close was your guess?
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Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.