Bird Nests Woven from Fibre-Optic Cables Illustrate War's Environmental Impact in Ukraine

A discovery near the front line of the war in Ukraine – a small bird's nest intricately woven from fibre-optic cable and grass – is offering a stark illustration of how Russia’s war is reshaping the natural environment.

Researchers say the more than four-year-old war has left vast stretches of the 1,200-kilometre (746-mile) front line blanketed with ultra-thin fibre-optic cables. These critical lines are deployed by both Ukrainian and Russian forces to guide aerial attack drones, rendering them impervious to electronic jamming.

Stretching up to 20 kilometres, these cables now lie tangled in trees, scattered across fields, and draped over rooftops in Ukraine's frontline regions, often glistening in the sunlight like an enormous spider's web.

Local birdlife have even begun repurposing these discarded materials to construct their nests. Yana Hrynko, a senior researcher at Kyiv's War Museum, cautiously examined two such delicate nests, which were sent to the museum directly from the front line by armed forces personnel.

"Objects such as bird nests with fragments of optic fibre demonstrate the change in the nature of war," said Hrynko.

Russia invaded Ukraine in February 2022 with tanks, armoured vehicles and artillery. Trying to counter Russia's advantage in such conventional equipment, Ukraine has poured resources into developing aerial drones. Drones now dominate the battlefield.

Hrynko said researchers did not know which birds made the nests nor how they had gathered the long cables.

"The first nest mainly contains dry grass and fibre-optic cable. And it's pretty tightly twisted," she said.

Several Ukrainian servicemen in the frontline regions of Donetsk, Kharkiv and Zaporizhzhia found such nests and posted their pictures and videos online.

One of the two nests will remain in Kyiv as a part of the War Museum's war collection, and the other will be sent for study in the Netherlands and later returned, researchers said.

Auke-Florian Hiemstra, a 33-year-old biologist based in the Dutch city of Leiden who specialises in artificial nest materials, said Ukraine had rich avian biodiversity and there were many species that could have built the nests.

"We're going to look for DNA traces still in a nest to determine who actually made the nest," she said. "I have never seen nests like this before - and I have seen many, many bird nests."

The impact of the fibre-optic on birds could be mixed, Hiemstra said. It could cause harm as the birds could become entangled but it could also benefit them by helping them make a strong nest. "And by documenting this nest, we're also documenting the impact of war on nature in Ukraine," Hiemstra said.