Northern Mockingbird

These pictures were taken on 4th December, 2007 at Mike Rhodes riverfront property, Mission Texas. Mockingbirds sing almost all year long and include imitations of other birds. Their song in the spring is entirely different than their song in the fall. Males sing more than females and single males sing more than attached males. Are the single males singing to attract a female or are they singing because they're happy with their single status? I'll let you figure that one out.