How flocks of birds are able to fly close together without colliding - Discover Wildlife

Why don't birds fly into each other? - Futurity

Scientists (finally) figure out why birds don't crash into each other.

Scientists are using machine learning to forecast bird migration and identify birds in flight by their calls

Fall Bird Migrations in Oregon and Where to Watch Them

These Masters of the Sky Can Fly for Hours (or Days) While Barely Flapping

The Basics of Bird Migration: How, Why, and Where

Celebrating Dark Skies During Spring Migration

How do birds know how to fly without crashing into things like buildings or trees? - Quora

Biological Effects of Electromagnetic Radiation on Birds - Environmental Health Trust

Stop killing birds to secure New York's air traffic, Avi Jorisch