What are two limiting factors that could affect the population of turkey vultures?

A Limiting Factor of a Turkey Vulture is not quickly discovered for they are a very Strong and Competitive species of birds, Although I have found that there Habitat "Being an Open Area is decreasing Fervently because of the construction of buildings. The second one is That carcasses are not easily found because we are creating safer soutunitions for our Roads, cars and other Human Things that usually create these dead Carrions.