It is always wise to be quiet when watching birds, especially when looking straight up. Logic implies that lighter birds, with the same amount of muscle and energy, should fly faster than heavier birds. Noise tends to scare birds. As a result, in the moment when a startled bird spreads its wings to fly, it will often lighten its load. This is also a good time to close your mouth.
Black-throated Gray Warblers generally winter in Mexico. However, they tend to breed in British Columbia and the Western United States, particularly to the west of the Cascades in Washington state. Click Here to see an animated display of their migration process.
1) Learn and leave established native flora undisturbed.2) Remove invasive species and then wait to see if native plants begin to grow without assistance. (When native plants start on their own, then these plants or trees are likely the most appropriate flora for the habitat.)3) Scatter seeds from nearby native plants in a similar habitat.4) If you feel you must add a new plant then select a native plant while considering how the plant fits with the specific habitat and understanding the plant's logical place in the normal succession of native plants.
My friend Elaine Chuang shared several resources (that were new to me) from the January 2022 Washington Ornithological Society meeting. The major new concept is that specific keystone native plants enable critical moths and caterpillars that in turn provide food for the great majority of birds, especially during the breeding season. Here are the top two links from her list.
Native Keystone Plants for Wildlife:
Resources for adding plants to your Pacific Northwest Garden: