<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Why are pigeons such filthy animals?
<|assistant|>
Pigeons are filthy animals because they often roost and nest in densely populated areas, which allows their feces, parasites, and other bio-contaminants to be easily spread to humans. In addition, these birds tend to fly over and land on surfaces such as cars, buildings, and other structures in city centers, leaving behind dirt, debris, and other microorganisms. Furthermore, pigeons lack the instinctive behavior to keep their environment clean, leading to urban pollution and an increased threat of disease.