What is a Den?
A den is a hollow space in a tree (this may have previously been made by a woodpecker), which the squirrel lines with soft and warm leaves, grasses and mosses. This provides an excellent safe and warm place for the squirrel to sleep and shelter from the elements. Dens are always hard to find because they are hidden away; they are generally built up in a tree and are often only spotted when you actually see the squirrel disappear inside.
