Will house wrens 's use the same nest , or do you have to clean out
the old nest?
Old nest boxes should be cleaned at the end of each season. Wrens will
return to the same boxes but they accumulate debris and parasites, etc. so
cleaning is very important.
This is interesting for I have a house wren nest as well. Yes, it is a
good idea to clean it out yearly.
Yes, either the original adults or offspring or whatever tend to reuse nests
year to year. Some research has indicated that males habitually offer females
a number of nest sites for her to choose as a active nest. I observed this year
that the pair actually frequented two nest sites, using
one for the nest and the other was frequently visited for reasons that only the
wrens could tell.
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Update: June 2012