Some bears have a radio cell
implanted so behavior and migratory movements can be traced. The Washington
State University uses the information gathered to research and improve
habitat management and to understand and trace migration patterns.
The bears are released into a den fashioned
by scooping out a huge, living tree with a chainsaw, layering in a bed
of straw and green boughs, placing them inside, and sealing up the entry
hole in order to protect them from predators. The bears exit in the
spring through a single hole higher up in the tree.