A sick or injured pigeon with no obvious signs of injury might:
- Sit apart from the flock looking hunched up and depressed
- Fluff his feathers up and, perhaps, have difficulty keeping his eyes open
- Stay on the ground when the flock flies off or at dusk.
- Walk in circles.
- Throw seeds in the air.
- Totter backwards
- Have fits
- Use its wings to walk with (usually because its feet have become tied together)
- Be unable to fly
You can often catch a sick pigeon by scattering unsalted peanuts and throwing a soft coat over it when it comes near.
Be patient. Sometimes you only have one chance to catch it!