Spring is the easiest time to see and identify the birds of Cooper Mountain, because they are in their best breeding plumage and singing up a storm. Join Metro naturalist and expert birder James Davis for this walk for beginners and intermediate birdwatchers. Bring your own binoculars or borrow a pair on site, and be sure to dress for standing outside on an open hilltop. Suitable for ages 10 and older. $10 per person. Advance registration recommended; call Tualatin Hills Park & Recreation District at 503-629-6350.