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Need link to help Tree swallows nest in EHS invaded environm.

18 years ago

English house sparrow populations here are extremely high, and the Tree swallow ones have became alarmingly low in recent years (even way up in the clear May sky it seems). So I had abandonned hope for a good while now...

...But said hope got rekindled yesterday with the Ivory-billed woodpecker news!

After numerous failures with a genuinely built and by-the-book-set bird box entry pendulum device (three words: EHS do hover!), I am looking for links or discussion groups that offer "state-of-the-art" (and legal... I am in Canada and live in the suburbs) solutions to try and get back Tree swallows in one's garden in man-made boxes and keep EHS the heck outta there!

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