The concept was developed by a Swedish startup called Corvid Cleaning, founded by entrepreneur Christian Günther-Hanssen. The idea quickly captured global attention because it blends urban environmental policy with animal intelligence in a way that feels both creative and controversial. Supporters see it as an imaginative solution that could cut costs and reduce pollution. Critics worry about the practical limits of training wild birds and the ethical questions raised when wildlife becomes part of a municipal cleanup strategy.
For cities, the main challenge is scale. Street cleaners can sweep up visible trash, but cigarette filters are small and scattered across pavements, parks, bus stops, and drainage systems. Cleaning them requires careful manual work that can take far more time than collecting larger waste items.
Municipal records cited in several reports suggest that Södertälje spends around 20 million Swedish kronor each year on street cleaning. That amount reflects the cost of labor, equipment, and waste processing.
According to Christian Günther-Hanssen, collecting cigarette butts alone can cost around 80 öre per piece, and sometimes as much as two kronor depending on the method used.
These numbers led to an unusual question. If cigarette butts are so small and widely scattered, could animals that naturally forage for tiny objects be trained to collect them instead of humans?
The question may sound whimsical at first, but it is grounded in well known facts about a particular group of birds. Corvids, the family that includes crows, ravens, and magpies, are widely recognized as some of the most intelligent animals in the world.
