 photo: File / David Monniaux |
They feast on garbage, cut off electricity, and frighten runners, but the villains in this story aren鈥檛 from a fictional Hitchcock film, they鈥檙e flesh and feather crows that plague Japan鈥檚 capital.
鈥淢any Tokyo dwellers have been dive-bombed by the big black birds 鈥 the species known as jungle crows 鈥 that flap around the city. Almost everyone knows someone who has been pecked or pooped upon,鈥 an NPR reported today. The crows 鈥渘est in utility poles and cause blackouts; they even steal fiber-optic cables to build nests, sometimes disabling parts of the broadband network.鈥
For eight years Tokyo officials have been fighting the big black birds that are most likely drawn to the city鈥檚 plentiful garbage, but last year the population grew by 16 percent to 21,000 birds, the city鈥檚 Bureau of Environment estimates.
To keep populations low, government officials trap and gas the birds caught in huge wire cages. Crows and their brethren (magpies, ravens, and jays) are known for their smarts, however, so most of the birds trapped are young and inexperienced, Koji Takagi, a manager of a park where cages sit, told NPR. And according to a that ran in The New York Times, the crows will remember when a person has wronged him.
鈥淚n the Seattle area, where rapid suburban growth has attracted a thriving crow population, researchers have found that the birds can recognize individual human faces,鈥 Michelle Nijhuis reported in the article.
A more effective鈥攁nd popular鈥攖actic to fending off the crows may be to employ the help of honeybees. 鈥淭he bees become very aggressive when they see shiny black objects, because it reminds them of bears or hornets who might attack them. So whenever they see crows, a whole swarm of bees will chase them," said Atsuo Tanaka, a co-founder of a hive-managing project in Tokyo called The Ginza Honeybee Project. The 300,000 bees Tanaka keeps on rooftops near a tony shopping district have another benefit: honey. The method may not be widely applicable just yet, but it could eventually prove to be one bird-friendly solution to a sticky situation.