Half a croissant, on a plate, with a sign in front of it saying '50c'
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Rotary Birdhouse Hole

One house caters to different species
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With birdhouses, restricting the entry hole size will typically restrict the size bird that may enter and nest. Large holes will admit more bird sizes and perhaps crowd out smaller, less defensive species but small holes may leave the house unused if that small species isn’t around.

With a hole sized for the largest desirable bird already bored one might create a circle of wood, with additional holes bored in the style of a rotary telephone dial, and mount it similarly to the face of the birdhouse. This way, the desired hole size may be dialed to line up with the entryway, and pegged in place.

whatrock, Jan 29 2016

(?) other uses for small birdhouse entrance https://www.youtube...watch?v=ZoCSCLIXn6U
[pashute, Feb 02 2016]

[link]






       Add a motor, and it could double as a mincer.
MaxwellBuchanan, Jan 29 2016
  

       Or just use tight enough trousers.
Ian Tindale, Jan 29 2016
  

       [Ian Tindale] is not only stranger than we imagine, he is stranger than we can imagine.   

       Incidentally, the Eurasian Lorikeet is one of the very few birds whose chicks are larger than the adults. Females of the species, when breeding for the first time, will sometimes select a tree-hole large enough to admit them, but too small to allow the chicks to exit. This is one of those baffling failures of evolution.
MaxwellBuchanan, Jan 29 2016
  

       It’s actually quite an advanced technique of horizontal gene transfer from the entire chick into to the tree.
Ian Tindale, Jan 29 2016
  

       Hmm, these must be much larger than ordinary birdhouses, one could even say they might be giants.
not_morrison_rm, Feb 03 2016
  

       What you need here is one of those dilating iris doors.
RayfordSteele, Feb 03 2016
  

       Are you suggesting we should make a little birdhouse in our soul?
Ian Tindale, Feb 03 2016
  

       ..who watches over me. But I'm sure it's NSA or GCHQ really.
not_morrison_rm, Feb 04 2016
  

       I always thought that was the job of Universe Man.
RayfordSteele, Feb 04 2016
  

       I think this is brilliant, and as an avid bird watcher/lover, I want to take this moment to thank thee, [whatrock], for creating an answer to this birdy dilemma.
blissmiss, Feb 05 2016
  

       Pleased I could bring you bliss [miss].
whatrock, Feb 05 2016
  
      
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