Pigeons Under Stress

A pigeon is down near my feeding spot this evening; the sixth pigeon in about a month. Similar to the others, this pigeon has an intact body, a partly-severed head, and is lightly-scavenged. I don’t know why this is happening: whether it’s disease or an attack. If a pigeon goes down every five days, or so, and nothing else changes, given that the local flock is composed of about forty pigeons, by the end of the year I’ll be out of pigeons. And then where will I be?