European Starling

European Starling (Sturnus vulgaris): A very common bird found across North America. They were introduced in New York from Europe and have since spread across the continent. These birds vary in color but are usually dark and speckled with an oily appearance. They are one of the most common birds in areas with humans present. 

I see European Starlings coming in and out of cracks and holes in buildings. I think they are fun to watch because of their speckly green and black coloration. I'm curious to know if they are considered an undesirable species...do they outcompete other, native birds in an area?