there are several types of small nesting birds?

Starlings 

Barn Swallows

Pigeons

Sparrows

Crows

 Nesting birds can damage residential and commercial buildings, by nesting in areas that are vital to building envelope integrity, such as soffits and HVAC systems.  They also can also carry diseases and spread them.

Bird Netting is an efficient way to discourage small birds like Starlings and Pigeons form nesting in your building soffits and damaging your investment.