What are the Three observations Darwin made about pigeons?

Darwin observed that pigeons exhibited a remarkable variety of traits, such as size, color, and feather type, which were the result of selective breeding by humans. He noted that these variations could arise from small changes over generations, demonstrating the principles of variation and inheritance. Additionally, he recognized that similar processes could occur in nature, leading to the adaptation of species through natural selection. These observations were foundational for his theory of evolution.