Should
People Kill One Animal to Save Another?
Since ancient times, owls have been
called many things, such as mysterious. These birds can be found in many parts
of the world. And today, one kind of owl is causing a problem in forests of the
northwestern United States.
Barred owls are a large species native to eastern North America, but they began moving west at the start of the 20th century. By 1973, large numbers of barred owls had arrived in the western state of Washington. Later they moved south into Oregon and California.
Barred owls are a large species native to eastern North America, but they began moving west at the start of the 20th century. By 1973, large numbers of barred owls had arrived in the western state of Washington. Later they moved south into Oregon and California.
In parts of the Pacific Northwest, the owls are now
believed to be causing a drop in the population of a smaller, less aggressive
bird: the northern spotted owl.
In many ways, the barred owl is the spotted owl’s worst enemy. The
barred owl has more babies per year and eats the same animals, like squirrels
and wood rats. And their numbers are now larger in many parts of the spotted
owl’s traditional territory.
David Wiens is a biologist with the U.S.
Geological Survey, a federal agency that studies the Earth and its natural
resources. He and other officials are doing something unusual to protect
spotted owls: killing barred owls.
It is a controversial,
experimental program. More than 2,400 barred owls have already been shot.
Wiens is the son of a well-known bird expert and grew
up with a fascination for birds. He has mixed
feelings about the program.
“It’s a little distasteful, I think, to go out killing
owls to save another owl species,” he says. But he adds, “We knew that barred
owls were outcompeting spotted owls and their numbers were growing too
fast."
To catch barred owls, officials put
digital bird callers on the ground. Then they step back and wait as several
sounds from the devices fill the air. All of this happens in the dark of night.
Barred owls dislike other birds in their territory, so
they will fly down and chase other owls out. That is when Wiens and his team
try to shoot them.
The federal government has been trying
for years to save the northern spotted owl. Some years ago, this bird was at
the center of a huge battle over logging rights
across Washington, Oregon and California.
In 1990, the northern spotted owl was listed as
threatened under the Endangered Species Act, and appeared on the cover of Time magazine.
Then, officials suspended logging on millions of hectares of forests to protect
the bird. But the spotted owl population continued to fall.
During that time, researchers began to study another
threat: Larger, more aggressive barred owls were competing with spotted owls
for food and space and pushing them out of some areas.
Now comes this final effort to see whether the
government can save spotted owls.
The U.S. Fish and Wildlife Service
launched the experiment a few years ago. It has raised questions, such as: How
much is it possible to reverse a drop in
population that has been happening for years, caused in part by human activity?
And, as climate change continues to push species out and affect how and where
plants and animals live, how much should people get involved?
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