A better way to exclude house sparrows is to increase the depth of the
hole. A double or triple thickness will discourage House sparrows without
affecting most other cavity nester (eg bluebirds, down woodpeckers, bewick's
wrens) in the same size class.


>
>Hello tweets;
> 1.25 is the recommended diameter by the nesting box handout from the
>backyard wildlife habitat program of Washington. 1.5 does exclude
>starlings, but unfortunately, house sparrows can still get in. For
>swallows, it is recommended to use the elongated slit opening that lets
>swallows squeeze in laterally, but generally excludes house sparrows.
>Janet Partlow
>partlowj at elwha.evergreen.edu
>
>On Wed, 16 Apr 1997, Mike Patterson wrote:
>
>>
>>
>> 1.5 inches is the diameter I use on all my nest boxes. It excluded Starlings
>> while letting Swallows, chickadees and wrens in.
>>
>>
>> >
>> >
>> >Greetings,
>> >
>> >I've got some starlings moving in to a tree right outside my window, and
>> >while guano is good for plants, I'd rather not have to look at it all the
>> >time.
>> >
>> >Do any of you know a good diameter that I could use to block out the
>> >beasts, but let in the meek?
>> >
>> >Thanks,
>> >Nick
>> >
>> >
>> >
>> >
>> >
>> >
>>
>> --
>> *********************************** I got the blues so bad one time
>> * Mike Patterson, Astoria, OR * it put my face in a permanent frown
>> * mpatters at orednet.org * but I am feelin' so much better
>> *http://www.pacifier.com/~mpatters* I could cake-walk into town
>>
>
>

--
*********************************** I got the blues so bad one time
* Mike Patterson, Astoria, OR * it put my face in a permanent frown
* mpatters at orednet.org * but I am feelin' so much better
*http://www.pacifier.com/~mpatters* I could cake-walk into town