FTA: Crows can do some pretty amazing things. They use tools. They can solve puzzles. They also, sometimes, have sex with their dead. Scientists placed a dead crow on the ground and watched how other crows reacted. Some mounted the corpse, and...well, you get the picture. It's not clear why the crows were getting busy with the recently deceased, but it may have been a confused response mingling aggression with sex.
Crows, like many birds, have a high IQ for the animal world. They are also very family oriented. I doubt the same behavior would have been seen with a family member