This is a fledgling Brown-headed Cowbird being raised by a Blue-gray Gnatcatcher (see previous bird image). Female Cowbirds are notorious for laying their eggs in the nests of other birds. They abandon their young to foster parents, usually at the expense of at least some of the host’s own chicks. This is difficult to see as someone who is passionate about birds because songbird species are declining as they are parenting another species offspring at the expense of their own offspring, which usually perish as the much larger cowbird grows and out feeds the small songbirds.

Brown headed Cowbirdcowbird