Dog Health Questions: What size does a nest box for pigeons need to be?

I am going to be keeping pigeons soon for the purpose of dog training. I have already built the hutch, but now need to construct nest boxes for extra shelter and protection (and for use after mating). What are sufficient dimensions for one nest box, and does it matter if the next box is secured above the floor of the hutch or on the floor? Any advice will help. Thanks for your time.

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Recommended Answer:
My uncle keeps pigeons and his nest boxes are a little not much smaller than these http://www.bartcaldenteytur.com/palomar4…

remember to put the wooden block in for the birds to stand on, not sure about the nests on the floor bit!

and try to use wood for the cage doors instead of metal or mesh i saves injury!

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• i recommend its at the top coz they mostly choose the top box
  and my tumbler pigeons keep fighting over it


• I use five gallon buckets with a brick in the top laying on the side and hang them from the top of the enclosure.