Because of unseasonably cold weather conditions, there are as yet no blooms to brag of in my backyard, or in my front yard for that matter. What I have instead are birds. Blackbirds. Several varieties, including Red-winged Blackbirds (
Agelaius phoenicus), Common Grackles (
Quiscalus quiscula), Brown-headed Cowbirds (
Molothrus ater), and European Starlings (
Sturnus vulgaris).
Several Varieties of Blackbirds

A Starling With Suet

Starlings are not native to North America. Although there are approximately 200 million starlings in North America, they are all descendants of approximately 60 birds released in Central Park, New York, by people who wanted every bird species mentioned in the works of William Shakespeare to be introduced to North America.
The European Starling is a hole-nesting species and will nest in just about any cavity it finds. Native species such as the bluebird have been adversely affected by this introduced species, which multiplied rapidly and can now be found throughout North America to the point of overpopulation.
It is a common practice where possible to set up nest boxes in backyards and wooded areas for native species to give them a chance, and to destroy Starling nests. In some cities birds of prey such as the Peregrine Falcon have been introduced or allowed to nest in built-up areas to help control the starling population. (Note: most of the information in the previous paragraphs is adapted from this
Wikipedia article.)
Building a Bluebird House

The Finished House

A few weeks ago, we participated in a project to build a bluebird house. These houses are specially designed to be specific to the Eastern Bluebird (
Sialia sialis). The hole is exactly 1.5 inches (3.8 cm) which discourages larger birds such as the European Starling. As well, instead of a perch there are small indentations, as the Eastern Bluebird can cling to them. This prevents smaller, more aggressive birds such as the House Sparrow from using the nesting box as they cannot feed their young without using a perch to rest on.
It's very unlikely that we'd get bluebirds nesting here, even if we hung the birdhouse. However, it was fun for my son to build, and we certainly learned a lot about the plight of native birds who have been negatively affected by introduced species.