Is it a bird? Is it a plane? I could hardly believe my eyes when I saw this cool photo of a crow landing on an eagle.

Photographer Hyeongchol Kim captured the moment while photographing birds on the plains in Gyeonggi-do, South Korea.
According to Caters News, the photographer was stunned when he saw the smaller bird swoop in on the eagle and perch himself on its back.
He said: "I saw the crow flying towards the much bigger eagle, and prepared myself to capture the fight on camera. However, the bird just hovered above the eagle for a few seconds - and then appeared to just latch onto his back.
"The eagle didn't seem to mind at all - I think they must have been friends."
Related content:
- Modern family: Hen hatches ducklings instead of chicks
- Slideshow: Grand National Pigeon Show champions
- Slideshow: Animal Tracks
TODAY.com multimedia producer Mish Whalen wonders if her two parakeets ever think about flying on each other's backs.