Birds speak in a language all their own. Through chirps, warbles, trills and calls, they advertize for mates, warn of approaching predators and defend territories. Naturalist and author David Lukas trains listeners to pick up on these cues and hear a new world, as KRCB's Danielle Venton reports. (Right, David Lukas observes a flock of unperturbed Canada geese grazing near Lake Merritt, Oakland/Danielle Venton for KRCB.)
Bird vocalization carries an astounding level of information and variety. Here, Lukas has collected three song dialects from the same species -- White-crowned Sparrow. (Image of White Crowned Sparrow, right, courtesy of Public Domain Images.)
Lukas recently published a book about the birds of the Bay Area. The region, he says, is the perfect place to be a birder.