As the largest bird of prey, eagles are harassed nonstop by birds of all species. Sometimes the hecklers are so persistent, it looks like the eagles “are being followed by mosquitoes,†says McGowan.
Phoo Chan, the bird photographer who snapped the photographs back in May 2014, offered a similar explanation on his 500px page:
Crows are known for aggressively harrassing other raptors that are much bigger in size when spotted in their territories and usually these ‘intruders’ simply retreat without much fuss.
However, in this frame the crow did not seem to harrass the bald eagle at such close proximity and neither did the bald eagle seem to mind the crow’s presence invading its personal space. What made it even more bizzare was that the crow even made a brief stop on the back of the eagle as if it was taking a free scenic ride and the eagle simply obliged.
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