WOLF: Yeah, it's beautiful. SUMMERS: Adrian Wolf knows birds. He once studied a threatened species called the streaked horned lark for over 10 years. WOLF: It has a piece in my heart, and it's little ...

Add Yahoo as a preferred source to see more of our stories on Google. Great Peninsula Conservancy stewardship director Adrian Wolf points up to the canopy while talking about the benefits of girdling ...

ADRIAN WOLF: The Swainson's thrush. It's a lovely, ethereal sound. (SOUNDBITE OF SWAINSON'S THRUSH CALL) WOLF: Yeah, it's beautiful. SUMMERS: Adrian Wolf knows birds. He once studied a threatened ...