| Both members of the pair excavate a hole in a decayed tree, typically a cottonwood or Ponderosa pine. |
| The high I.V. of boxelder in a point bar dominated by cottonwood is an example of such a combination. |
| Notably, poplars and other cottonwood trees need moist soil and prefer riparian zones near streams and lakes. |
| When pasturage was unavailable, trappers, like the Indians, fed their animals the sweet bark of the cottonwood trees. |
| We'd go for long walks on the trails, long walks amid the discarded cottonwood and aspen leaves, and laugh at the rustling sounds they made. |
| Nests are usually built in deciduous trees, such as aspen, alder, cottonwood, or willow, but they may also be in firs or other conifers. |
