|House Wren. Dixon Lake, Escondido, California. April 15, 2016. Greg Gillson.|
The lively bubbling song begins with a distinctive harsh "churr" note.
Winter birds are most common in coastal lowlands. Their wide variety of short harsh calls can sound like the calls of California Gnatcatchers and Ruby-crowned Kinglets that share the same winter habitat. I'm inclined to view this as mimicry rather than coincidence--even though calls in songbirds are generally hard-wired and immutable, while songs are learned while young.