sentences:  Today, the park is the site of major conservation efforts—it is home to coho salmon and steelhead trout, both of which are threatened species, as well as the northern spotted owl.The Parks Conservancy operates a bookstore at Muir Woods, and supports staff who welcome visitors and provide orientation and interpretation of the national monument.Muir Woods are perhaps best known for their stunning historic redwoods and paths; these trees are anywhere from 400 to 800 years old.