How much bird is there, anyway?
10,000 Birds
JULY 21, 2011
Here’s some data from the famous research project of Manu, Peru, giving biomass in kilograms per hectare. There are probably other major trends that depend, for example, on latitude and timing. But if you look at a bit of prairie in South Dakota during the dead of winter, you may see very few birds and a lot of bison.
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