Interesting. Thank you! 

I have 30 or so ‘street’ pigeons that hang around and eat my neighbors feed. So I’m off to a head start. 

What I had in my head is to let the feral birds be free and just ‘lure’ them into my backyard to get used to feeding there. 

Though I don’t know the legalities of this method in my area, although I did read once they are considered pests and not regulated in most of North America.