California’s largest lake has long attracted visitors. Many go there year-round to see thousands of birds congregating around the lake and its nearby habitats, but the lake is changing and that’s changing bird populations. More than 400 different species have been recorded here and estimates put the daily bird population around the sea at more than 100,000. That’s great for bird watchers like Ryan Llamas. The Audubon Society member’s binoculars are pressed tightly against his eyes as he scans the open water.