Interchangeable lenses offer versatility in birding photography, allowing you to adapt to various shooting situations and capture birds at different distances. While not essential, having the option to use telephoto lenses with longer focal lengths, such as 300mm or more, can bring distant birds closer and reveal intricate details. However, cameras with high-quality built-in lenses, like the Sony RX10 IV, can also deliver impressive results without needing interchangeable lenses.