Hi Sara,

You are definitely in a sticky situation. I would be hesitant to remove the wren sticks or leave the box open unless you installed a wren guard. More information can be found at the link below. Can you put up a third box for the blues? If not I would install the wren guard on the TRES box and leave the wren box open and see what happens. Are the boxes located near lots of trees? Maybe you could move it out in the open more away from trees. I believe a wren was the culprit for removing nearly all the eggs from my chickadee box for no known reason at all. The third TRES is probably another male searching for a cavity to nest in. I have witnessed multiple TRES come to a box to help other TRES when they are in distress like a HOSP fighting with them. They gang up on enemies sometimes which is cool.

Please read below on the wren guard. I just found that forum recently. Do this first and then check back here for others advice. Good luck!

http://bluebirdnutcafe.yuku.com/topic/5332/How-to-make-a-Wren-Guard

Thank you for your info! I had put wren guard on before, I will try to put wren guard on.

But, I remember reading it at other places that wren guard is To prevent wren from discovering the nest. Since the wrens were around when tres built the nest, wren definitely know the existence of tres nest. So far TRES and wren have been getting along fine: they built their nests in presence of each other, they don't fight, just mind their own business, sometimes, both TRES and wren sticking their head out of holes, looking at each other, I think:-)

I am just worried that if I upset the wren, they may start to attack the TRES eggs. On the other hand, I am also worried that wren may decide one day to destroy the TRES eggs.

Does any one have experience that TRES and wren getting along?

I would not put a wren guard on a TRES nest, it won't work and I don't think they will accept it. TRES do things differently in that one will sit and wait at the hole watching for its mate and when it appears the one inside flies out and the other flies in. This cannot happen with a wren guard.

While I highly doubt wrens and TRES can nest together successfully, I don't think putting a wren guard on a TRES nesting will work.

Good luck though....

Dzyg, your description about TRES is exactly what I observed. I saw tres poking it's head out of the hole most of time of the day. I guess I will not put wren guard on then.

I checked the wren box, it's not a real nest. Just lots of twigs. I haven't seen wren in and out of the box as frequent as before. But I hear them. Don't know what to do.

TRES is very interesting, not as skittish as BB. They just look at me when I walk by. I opened box once thinking that nobody was around and finding one sitting on the nest, didn't even fly away.