
According to scientists, the eagles changed their migration routes through Ukraine to avoid the fighting and because their habitats were probably destroyed by the war, writes the BBC.
Researchers believe the eagles avoided dangers including artillery, aircraft and tank fire as well as massing troops.
They fly through Ukraine every spring on their journey from Greece and the Sudd – a large wetland in South Sudan to breeding grounds in Belarus.
The scientists studied GPS data from birds tagged in the months after the February 2022 invasion, a period of heavy fighting in northern Ukraine as Russia sought to capture Kiev by sending troops south from Belarus.
"The war in Ukraine has had a devastating impact on people and the environment. Our findings provide a rare window into how conflict affects wildlife," said lead author Charlie Russell, a postgraduate researcher at the University of East Anglia.
Classified as a vulnerable species, the great spotted eagle is a large brown bird of prey.
Researchers began tracking them using GPS tracking devices in 2017, but did not expect to track them in an active conflict zone five years later.
The results show that the eagles made large deviations from the previously mapped routes.
They also spent less time stopping at their usual eating places in Ukraine or avoided them altogether.
For migratory birds, stopovers are essential places to obtain food, water and shelter.
"I think the take-home story is that the conflict in Ukraine is fundamentally disrupting the migratory ecology of this species," said Jim Reynolds, assistant professor of ornithology and animal conservation at the University of Birmingham.