I keep homing pigeons, that bird looks like a homing pigeon. The band on the right foot would be the registration band, by the color of the band and the bird's appearance I would guess that it is a 2007 blue bar cock bird. There are a few national homing pigeon associations, see for example:
American Racing Pigeon Union | Homing Pigeons | Sport Flyers
The band on the left foot might be just a colored band or perhaps an RFID chip band used with electronic clocking systems.
Pigeons eat grains and seeds, pigeon feed mixes generally contain seeds such as corn (popcorn seeds, small yellow corn, etc), peas (austrian, maple, etc), milo, millet, oats, wheat, safflower, rice, canary seed, barley, vetch, rape, buckwheat, ......
Besides grains/seeds, the birds need water and grit/minerals.
It looks like that bird wants you to help him out, perhaps you can catch him and put him in a cat carrier or similar. You can then read the registration band, you might need to wash the band if it's dirty to make sure you can read it correctly. Then when you have the band info you can track down the owner or call me at 865-924-nine-zero-three-one and I can help you.