Neilster,thank you for caring for the Pigeons,we have been feeding Pigeons for several years,we sometimes have only 5,but most of the time about 30.
The Hawks get them in the winter and it's a terrible thing to see,but the Hawks too have to survive.
I hope you solve this problem..in some cultures Pigeons are for the dinner-table,maybe that's why they are caught in the netting??
"The cruelest animal is the Human animal"
3 kitties,Rocky(r.i.p my boy),Chico,Vinnie