10,000 Birds

FEBRUARY 4, 2020

There’s more, so much more, in this highly informative, detail-packed, research-based description of bird behavior. He aims to bring together all ornithological and ecological research on birds and winter the world over–not just in areas covered by snow–and summarize the findings in non-scientific language.

Research 165

Research Birds Hoarding Sweden 165

10,000 Birds

NOVEMBER 6, 2018

The one on the left is from the book being reviewed here, Birds of Central America , and the plate on the right is from Birds of Peru. The images on the right, from the Peru field guide, are more intense in color. The two plates above are both by Dale Dyer. Compare the images of Blue-gray Tanager. The picture gets complicated.

America 211

America El Salvador Costa Rica Honduras 211

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.

Mammals 172

Mammals Rodents Birds Reptiles 172