Date: 6/19/19 9:47 pm From: Roger Freeman <freemanbecard...> Subject: [obol] Re: House Wren are vicious predators
Unfortunately this is true of House Wrens. Not hard to find references to this on the internet with a quick search. I did not have a HOWR for decades until a couple years ago, and although I enjoy their lovely singing and activity, I am also observing similar behavior. I suspect an active Black-capped Chickadee box I had was recently shut down by a territorial HOWR male. Not sure how much to tolerate.
On Wed, Jun 19, 2019 at 9:30 PM Maeve and Dick <maeveanddick...> wrote:
> We have 41 nesting boxes on our 10 acres about 5 miles south of > Eugene. I have been managing bird houses for close to 40 years, 24 years > at our current location. Our target species is Western Blue Birds but we > do not have the best habitat for them so we get lots of Violet-green > Swallows, Tree Swallows, Black-capped Chickadees, Chestnut-backed > Chickadees and of course House Wrens. House Wrens do not play well with > others! Every year we have nests that have been destroyed by House Wrens. > They break eggs, kill chicks, sometimes kill adults, throw eggs and chicks > out of the nest and rip the nest apart and throw the materials out the > hole! They also fill houses with sticks so other birds cannot use them. > We have been having about 20 to 25% of our nests destroyed or houses filled > with sticks by House Wrens over the past 15 to 20 years. > > > > We checked our houses today and we have had nine houses where the > eggs and chicks were killed by House Wrens and another nine filled with > sticks. That is a total of 44%, much higher than any previous year!! This > is discouraging to us and upsets us to see so many eggs and chicks killed. > If anyone has a thought as to why the seemingly sudden increase in the > number of House Wrens, let me know. We are researching for bird house > modifications that seem to discourage House Wrens but still allows other > small birds to use the box. > > > > Dick Lamster >