Answer: variety of factors
Explanation:
Barn owls are endangered due to a variety of factors, including loss of habitat, predation, collisions with man-made structures, and pesticide use. Loss of habitat is a major factor, as suitable barn owl habitat is becoming increasingly scarce. Predation from other animals, such as cats and rats, is also a threat to barn owls. Collisions with man-made structures, such as wind turbines and power lines, also pose a danger to barn owls. Finally, pesticide use can also be detrimental to barn owls, as it can reduce the availability of their prey species.