Brown Thrasher

What 636 Brown Thrasher Stomachs Revealed

The same 636 thrasher stomachs produced two different verdicts in the 1915 and 1926 printings of the government’s bulletin — both reproduced verbatim, side by side, with an 1882 naturalist’s catbird account.

Peregrine Falcon

How Fast Do Birds Actually Fly?

Measured flight speeds and banded travel rates for named species — and why the mile-a-minute folklore is wildly wrong — reprinted from the Fish and Wildlife Service’s classic circular on migration.

A male Eastern Bluebird perches at the entrance hole of a weathered wooden birdhouse.

How Big Should a Nest Box Hole Be?

The exact box dimensions, hole sizes, and mounting heights that bluebirds, wrens, swallows, and purple martins will actually accept, from the Forest Service’s own species accounts.