Chaparral refers to a type of natural habitat where the rocky soil supports a community of nearly impenetrable shrubs. Often chaparral is found on either south or west-facing slopes, locally dominated by such plants as Chamise (especially in older sections), four species of manzanita, Black Sage, Buck Brush, Jim Brush, and California Sagebrush. To the casual birder, the chaparral poses a difficult challenge to even get a glimpse of its skulking birdlife. Mount Diablo’s extensive and relatively easy accessible chaparral provides an unequaled opportunity for birdwatchers to explore its mysteries.The feathered denizens of the chaparral are notorious for being shy and can be difficult to view. Observers should take advantage of chaparral birds using conspicuous singing perches and familiarize themselves with their vocalizations. Sometimes an individual shrub (such as Toyon) can be loaded with ripe berries and will attract a large variety of birds. Many of the chaparral birds are actually very curious and can be easily attracted by a practice sometimes known as "squeaking". This is a series of assorted noises made by the birdwatcher, the principle one being a slurred call that resembles the admonishment "shhh". Note though that birds are easily frightened by sudden movements. Also, I have noticed that birds in breeding season are more easily disturbed when I wear white rather than by other colors.

Extensive chaparral is located along Wall Ridge (accessible from either Rock City or Macedo Ranch) and along Knobcone Point trail (access from Curry Point). I prefer the Wall Ridge area due to recent fires. A very productive area along Summit Road is the section from the Pines Picnic Area to Pioneer Horse Camp. One of my favorite sites is Muir Picnic Area, a productive area nearly year round. White Canyon is often visited by birders, though it has rather dense chaparral and it can be difficult to view chaparral birds here.