Chickens have a hearing range that is slightly narrower than that of humans. It falls within the range of 15-10,000Hz with their most sensitive range being between 1,000-4,000Hz. Their main vocalizations, of which there are around twenty, tend to fall in this range and run from around 500-6,000Hz. Slight differences in pitch, tone and rhythm enable recognition of individuals (or imposters) even if the bird calling cannot be seen. Chicks will learn this at a very early age, ensuring they always respond to the right mother’s call.