Artificial cavities have become a standard management technique for red-coc
kaded woodpeckers (Picoides borealis). Seventy cavity inserts were installe
d in our study sites on the Angelina National Forest in eastern Texas from
1990 to 1995. Eighty-two percent of the inserts were used for at least one
year. It is still too early to make a direct comparison, but it is likely t
hat inserts will remain usable as long as natural cavities do. Inserts inst
alled in 1990 and 1991 were 20.5 cm in height, whereas inserts installed fr
om 1992 to 1995 were 25.5 cm in height. Larger inserts (25.5 cm) appear to
remain usable for a longer time than smaller inserts (20.5 cm). Newer unuse
d inserts are more likely to become active for the first time than older un
used inserts. Similar to unused inserts, active cavities (naturally excavat
ed and inserts) that have become inactive are less likely to be reactivated
the longer they are inactive. Newness and recency of cavity use and red-co
ckaded woodpecker activity appear to be important factors in the attractive
ness of inserts and naturally excavated cavities.