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New Box / proximity / same pair?

13 years ago

Hello. Was great to read new Posts. I see that we're not the only ones behind this year. We're zone 6b/7a northern VA - just yesterday seeing the forsythia in full bloom - what a Spring this has been!

Background: 3 acres, outer suburban country, we're probably 6 miles from the nearest parking lot. Last year our first year w/2 boxes, and 1 box had 2 clutches Blues (Chickadees in the other). We had a group of 5 or so mixed male & female Blues all winter moving around the area.
Some pair of Blues have been defending the Original box since early Feb, around same time we noticed a HOSP, so put up mono filament - haven't seen it back. They began building a week or so ago, and today we see a completed nest in this box. We're keeping close eye.

This year we wanted to add a third box, which we just completed this past weekend. It is a diagonal (on 3 acres, recall) location on the lot with our house between - no sight line between the two, and about 400-450 feet distance, we guess - however the primary birdbath is visible from both.

Anyway, we put up the new Box this weekend, and in 20 minutes it is being aggressively defended by a Blue (poor Chickadee!). We have seen now BOTH boxes being defended by Blues, and a pair also hovering around the new box. Today we see that there's nesting in the Original box. We're not sure if 3 acres can support TWO pair or not.
Would the pair from the Original box also defend the New box, do you think?

All that for one question. Your thoughts appreciated!

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