 The refuge is home to almost 200 species of birds , more than 50 mammal species , and 25 species of reptiles and amphibians . Tree species include red alder , aspen , maple , oak , Oregon white ash , Douglas fir , ponderosa pine , Pacific yew , and cedar . A pair of 350 @-@ year @-@ old oak trees can be found at the visitor center . Plant species in the refuge include bulrushes , wapato , water plantain , as Oregon grape , wild trillium , camas , iris , snowberry , cattails , wild millet , wild rose , thimbleberry , and others . Wildflowers include blue chicory , Douglas spirea , and purple crocuses . 
