I have 5 hens, 2 roosters and 2 ducks. I have been going thru 50lbs of food in a week. I know I have a possum eating the food and stealing any eggs laid on the floor. Some days I don't find any eggs, just the broken shells on the floor. I have also seen my cats eating the chicken food, even though they have already been fed.
If you get cats, be sure to have them fixed! I ended up with 20 cats from 1 kitten I got 3 years ago. This summer I got lucky and found a few people to take a lot of them for barn cats. I now have 7 fixed cats and 1 hobo cat that hangs out occasionally.