The term refers to pre-recorded visual clips of avian creatures in flight, filmed against a solid green backdrop, which are offered at no cost. These digital assets are specifically designed for incorporation into other video projects through the use of chroma keying techniques, allowing for the removal of the green background and seamless integration of the birds into different scenes. As an example, a filmmaker could use such a clip to depict birds soaring over a cityscape without needing to film actual birds in that location.
Access to these resources offers several advantages. It eliminates the need for complex and expensive location shoots, specialized equipment, or the ethical considerations associated with filming live animals. This simplifies the video production process, reduces costs significantly, and allows for greater creative control. The availability of such resources has evolved alongside the rise of digital filmmaking and the increasing accessibility of video editing software.