Grand Canyon National Park River Ecosystem Threatened by Kazakhstan Beetle?

National Geographic: This story is part of a National Geographic News story on global water issues. Tamarisk trees are invading, crowding out native trees along rivers in the southwestern United States. But their removal could further imperil the endangered southwestern willow flycatcher, a sparrow-sized songbird. For decades biologists have tried to remove tamarisk--which grows up to 16 feet tall--manually and with herbicides and other strategies. But they are still losing ground to the sprawling tree. Now, some......

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