Pack rats are known for collecting and hoarding items, often to the point of clutter and disorganization. This behavior can be seen in other animals as well, such as magpies and squirrels. Some synonyms for pack rats include hoarders, collectors, accumulators, clutterbugs, and stackers. These terms all refer to individuals who have a tendency to hold onto possessions, sometimes to an excessive degree. While pack rat behavior can be problematic, it can also be a sign of creativity, resourcefulness, and thriftiness. It's important to strike a balance between keeping items of value and letting go of things that no longer serve a purpose.