#birds #nest
Cornell Lab of Ornithology
I collect bird nest building materials in glass jars.

It's Nest Building Time- The Dos and Don't of materials to provide for birds to build their nests.
- Do provide any combination of the following: dead twigs and leaves, dry grass (make sure the grass is chemical-free), feathers, plant fluff or down (e.g., cattail fluff, cottonwood down), moss, bark strips, and pine needles.
- Don’t provide: plastic strips, tinsel, cellophane, aluminum foil, dryer lint, animal fur or hair (including human hair), yarn, felt, or bits of cloth.
https://nestwatch.org/