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There are a few descriptions on BYC
The flies are attracted to blood, injuries, dying tissue. I read a few threads here where a hen had an egg break inside and got a little injury, then about a week later the hen gets bloated, stops laying and usually dies. One person in Vancouver had been giving her hen near daily baths thinking it was lice, and then one morning went to the coop to find her hen covered with flies and maggots and they were flying out of her cloaca! There was another I read where a vet did an autopsy and the bird was half eaten on the inside and another where a silkie roo recovered, but they were all digging and eating his flesh along the crease near the top of his leg and I think under his wing. The maggots eat primarily dead meat, but when they run out, they will eat fresh tissue as well. They produce a toxin that can kill a dog in 12 hours. I don't think I'd want to attract carrion maggots to anywhere near my hens! The maggots are pointy shaped. I've seen them on a dead rabbit (I think) when I went for a hike near here.