birds - A pigeons' nest doesn't seem to have a "bed" for the chicks, should I add one to it? - Pets Stack Exchange
Pigeon Racing and The Importance of Nest Boxes | Winning Pigeon Racing and Racing Pigeons Strategies - Pigeon Insider
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Love Bird Breeding Box — New York Bird Supply
How to Create an Aviary for Rescued Pigeons (or Doves) -