1) Avian messengers 2) Billions of years, to swine 3) Birds of clay 4) City nesters 5) Cooers 6) Dove relatives 7) Dupes 8) Easy marks 9) Frequent park statue visitors 10) Homing birds 11) They peck in the park 12) Urban birds 1) Citybirds 2) Easy marks 3) Goura 4) Pouters