Birds do not see black glass, as they perceive glass as a transparent barrier. However, they may see their reflection in the glass, which can sometimes lead to collisions as they mistake it for open space. To prevent this, some buildings use bird-friendly glass with patterns or coatings that make it more visible to birds. **

Birds cannot see glass because they perceive reflections in the glass as an extension of their surroundings. This can lead them to fly into windows or glass structures, as they do not recognize the barrier. Additionally, birds have a different visual system compared to humans, which may contribute to their inability to detect glass. The transparency of glass also makes it difficult for birds to distinguish it from open space. **

It is not uncommon for birds to chirp or sing along to music. Some birds are known to be attracted to certain sounds or melodies and may respond by vocalizing. This behavior is more commonly observed in pet birds or birds in captivity, as they may be more exposed to human-made music. In the wild, birds may also vocalize in response to natural sounds or rhythms. **

Birds do not see glass as a solid barrier because they perceive reflections in the glass as open space or a continuation of their surroundings. This is due to the way their visual system processes information, which can sometimes be misleading when it comes to transparent or reflective surfaces like glass. As a result, birds may fly into windows or glass structures thinking they can pass through them. **

Birds are transported home in a variety of ways, depending on the circumstances. Some birds may fly back to their nests or roosting spots on their own. Others may be carried in the beaks of their parents, especially when they are young and unable to fly long distances. In some cases, birds may be captured and transported in cages or carriers by humans, such as when they are being relocated for conservation purposes or as pets. **

Birds typically find their way back home using their keen sense of direction and memory of landmarks. They rely on visual cues, such as the position of the sun and stars, as well as their ability to detect Earth's magnetic field. Some birds also use vocalizations to communicate with their flock or mate during migration, helping them stay connected and navigate back home. Overall, birds have evolved various strategies to successfully navigate long distances and return to their breeding grounds. **

Budgerigars are considered nomadic birds. They are known to move in search of food and water, and their movements are often influenced by changes in weather and resource availability. While they do not have a set migration pattern like some bird species, they are not sedentary and can cover large distances in search of suitable habitats. **

It is unclear what is meant by "birds are behind birds" without further context. It could refer to birds following other birds in a flock, birds being positioned one after the other in a line, or birds being hidden or obscured by other birds. The interpretation would depend on the specific situation or scenario being described. **