A type of care behavior in which certain species of birds roll their bodies in dirt to help in their battles with external parasites. Examples of this can be seen in the House Sparrow and the California Quail. Found on http://www.encyclo.co.uk/local/22214
Trimming of the hair, typically ¼ inch or less. The amount of hair trimmed is usually so small that it appears as dust. Found on https://www.encyclo.co.uk/local/22745