Spearow is a fierce bird Pokemon. They are very common and one of the first Pokemon to be seen during the Pokemon journey. Spearows pop out a lot in grassy terrains and are pretty much seen everywhere. They can be quite vicious and when they attack in a group, they are shown to be a massive threat.
In the beginning of the anime, Ash accidentally agitated a Spearow, causing a whole flock of them to chase after him and Pikachu. They attacked and severely injured Pikachu.
Its name is a combination of spear and sparrow.
Spearow has a very loud cry that can be heard over half a mile away. If its high, keening cry is heard echoing all around, it is a sign that they are warning each other of danger.