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If you shoo a pigeon, that bird is likely to remember you and know to stay out of your way the next time you cross paths, according to a new study. Researchers found that wild, untrained pigeons can recognize individual people's faces and are not fooled by a change of clothes.

Previous research in this arena had only focused on the perception abilities of pigeons that were trained in a lab environment, but the new study was conducted on untrained feral pigeons. At a park in Paris, two researchers of similar build and skin color, but wearing different-colored lab coats, fed a group of pigeons.

One researcher ignored the pigeons after feeding them, allowing them to eat the food, while the other was hostile and chased them away. This was followed by a second session when neither researcher chased away the pigeons.