How Artificial Light Negatively Impacts Birds

Bird Migration Basics

Of the roughly 10,000 species of birds worldwide, around 4,000 of them migrate.
Of that 4,000 90% do so at night.

Why Birds Migrate at Night

Less predators
- With most of life going to sleep and/or resting at night, birds can fly without the stress of escape.
The stars (more details below)
- The stars can be used as a map, telling the birds which way is north/south.
- The stars emanate short wavelengths of light, which enables their ability to sense (and possibly see!) Earth’s magnetic field.
Less turbulence
- As the sun sets, Earth’s surface cools faster than the air around it. As a result, less turbulence; making flight easier and more energy efficient.
The moon
- The moon can be used as a landmark, indicating direction; and its gravitational pull controls the tides — the sound of which are used by shorebirds to find land.

The Stars as a Map

Almost all migratory birds have been shown to use the stars as a map. But how?

Seeing Earth’s Magnetic Field

Less predators

Plant For Birds

Bring birds to your home with native plants!

Did you know that wherever you live, some careful plant choices can turn your garden, patio, or balcony into a more beautiful and environmentally friendly space, while helping to protect birds.

Grow native plants to help bird populations across the country adapt and thrive, now and in the future.