Drones dominate the Russia-Ukraine battlefield: with fiber optics everywhere, a frontline town is turned into a “Spider Silk Cave,” and birds build nests using fiber optics.

Near the Ukrainian frontline, soldiers found several unusual bird nests—not made of dead branches and mud, but woven from grass mixed with fiber-optic cables used for drone combat, and they were sent to the Kyiv War Museum for collection.

(Background: Fourth anniversary of the Russia-Ukraine war: 1.8 million casualties, $200 million knocked out every hour, 19k children abducted)

Table of contents

Toggle

• Bird nests found by soldiers at the front line
• “Spider-web” spawned by drone warfare
• Biologists: The impact is still unknown

Sunlight spills over the treetops and rooftops along the Ukrainian frontline, and thin strands of wiring glint in the light. At first glance, they look like a massive spider web spread across the fields and between towns—like the “Silk Thread Cave” from Journey to the West. But in fact, these strands are fiber-optic cables used for drone combat, and within them, several birds even quietly build their own homes using the fiber optics.

Bird nests found by soldiers at the front line

The bird nests made by weaving grass and fiber-optic cables are among the collections the Ukrainian military sent to the Kyiv War Museum after discovering them near the front line. Reuters recorded the process in a video, where a soldier who found the nest could not help exclaiming, “What a thing.”

Museum senior researcher Yana Hrynko said that such nests reflect a shift in the type of warfare. She said, “I don’t remember seeing a nest like this in 2022 (the year Russia launched its full-scale invasion).” In other words, the phenomenon of birds building nests with cables is a new scene that has emerged on battlefields in recent years.

“Spider-web” spawned by drone warfare

These fiber-optic cables have appeared in large quantities amid Ukraine’s woods and fields due to tactical needs driven by drone warfare. Both Ukrainian and Russian forces use extremely thin fiber-optic cables to guide FPV drones for aerial attacks, because cable transmission signals are not affected by electronic interference, making them harder to counter than wireless radio control.

A single cable can extend up to 20 kilometers (about 12 miles). After use, it is often left behind where it lies, tangled in tree branches, spread across fields and the rooftops of towns, and over time forms a bright, web-like spectacle in the sunlight.

The Ukrainian front line stretches about 1,200 kilometers. Today, drones dominate the entire battlefield, and Ukraine continues to投入大量資源 develop air drones in order to counter Russia’s advantages in traditional firepower. As a result, the cables are almost everywhere, turning into an unexpected source of nesting material for birds.

Biologists: The impact is still unknown

Auke-Florian Hiemstra (33), a biologist working at the Biodiversity Center of Naturalis in Leiden, the Netherlands, has long studied how birds use artificial materials to build nests. In the past, he also documented cases of birds nesting using anti-bird spikes, plastic artificial flowers, and urban trash—making him a well-known researcher in this niche field.

Regarding these nests built from fiber-optic cables in Ukraine, Hiemstra said candidly that, because the local bird diversity is rich, it is still unclear what the cables’ use by birds ultimately means. He is also cautious about the cables’ effect on birds: on the one hand, artificial materials may harm birds, causing them to get tangled and injured; but on the other hand, these materials may also help birds build stronger, more durable nests. How to strike the balance between the two is still unknown, and more research is needed to answer.

Tags: FPV dronesNaturalisRussiaKyiv War MuseumUkraine