Trading habit
Encyclopedia
Trading habit is a behaviour exhibited by rodent
Rodent
Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

s (and more specifically, by pack rat
Pack rat
A packrat, also called a woodrat, can be any of the species in the rodent genus Neotoma. Packrats have a rat-like appearance, with long tails, large ears and large black eyes. Compared to deer mice, harvest mice and grasshopper mice, packrats are noticeably larger and are usually somewhat larger...

s) in which they will drop an item that they are currently carrying in favour of another, more attractive item. It is particularly pronounced in the Bushy-tailed Woodrat
Bushy-tailed Woodrat
The Bushy-tailed Woodrat, Packrat, or Woodrat is a species of rodent in the family Cricetidae.It is found in Canada and the United States....

, which may incorporate a wide range of natural and manufactured items in its midden.
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