One of the primary collectible hunts in Grand Theft Auto IV involves finding and shooting 200 flying rats, also known as pigeons, hidden throughout Liberty City. This is a time-consuming but rewarding activity for completionists.

How to Find Pigeons:
Pigeons are small, stationary targets often found on ledges, rooftops, signs, and other elevated surfaces. They emit a distinct cooing sound when you are nearby, which can help you locate them. You'll need a weapon with good range and accuracy, such as a Pistol, Carbine Rifle, or Sniper Rifle, to shoot them down.
Rewards:
There is no immediate in-game reward for shooting individual pigeons, but collecting all 200 is required for 100% game completion and unlocks the 'Liberty City (5)' achievement/trophy. Additionally, once all 200 pigeons are collected, a special reward is unlocked: the Annihilator helicopter will spawn on the helipad in the northeast corner of the Algonquin borough.
Tips for Hunting:
- Use a guide or map to pinpoint their locations, as they are very well hidden.
- Always carry a sniper rifle for long-range shots.
- Some pigeons are in hard-to-reach areas, requiring careful positioning or even a helicopter.
- Save frequently as you progress through the hunt.
This activity encourages thorough exploration of every nook and cranny of Liberty City.