What type of raptor or egg cannot be bartered, sold, or purchased?

Wild-caught raptors cannot be bartered, sold, or purchased due to legal protections aimed at preserving wild populations and maintaining ecological balance. The regulations surrounding raptors often stem from conservation efforts, especially for species that may be at risk due to habitat loss, environmental changes, or illegal trade practices.

Captive-bred raptors, on the other hand, are bred in controlled environments and can typically be sold or exchanged under regulation because they are not removing individuals from wild populations. Imported raptors also have specific guidelines governing their ownership and transfer.

Endangered species raptors are subject to stringent laws, and while they cannot be bartered or sold, it's primarily because their conservation is critical for their survival, and ownership is heavily regulated or prohibited to protect these vulnerable populations. However, the focus in this case is on the stipulations concerning the ownership and exchange of wild-caught birds, which is strictly prohibited to prevent negative impacts on their populations. Thus, the correct answer emphasizes the legal restrictions around wild-caught raptors.