One of my older siblings raised pigeons when they were growing up and discovered somethings about pigeon reproduction.  First they learned how to tell male from female pigeons, something to do with the bone structure down there, so exciting, not really.

Then during the first winter they felt sorry for the birds since it was so cold out.  So they installed heat lamps to keep them warm.  Well that apparently singled the pigeons to start lying eggs.  Who knew, so the lamps were removed from the coop.  Thou the winter made it easier to clean up after them.  They would sit in the same spot to keep warm and it would all pile up behind them, as opposed to being everywhere when it was warmer out.  As a side benefit, our garden had a lot of fertilizer.

They also raised a breed called a “roller”, the pigeon would fly along and then proceed to roll and crash to the ground.  Knowing this, once when my friends were visiting the pigeons were flying overhead and I acted like I was shooting at them.  On cue one of the rollers dropped to the ground.  They were shocked.