"They're losing lots of habitat - lots of woodland," says Spencer. "And we're also knocking down old buildings, making our homes warmer, more airtight - there are less places for them to go."
Music festivals
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Actor Matthew Rhys is asking Americans to celebrate their cultural connection with Wales
* @return {number} - 最短无序连续子数组的长度，排序该子数组后整个数组升序