The article discusses the increased risk of external parasites, such as mites and lice, in cage-free egg-laying facilities. Amy Murillo's research highlights how cage-free environments can create more opportunities for parasites to spread among chickens. These parasites can cause irritation, feather damage, stress, and other health problems that affect the chickens' overall welfare. Even low levels of infestation can negatively impact the health and well-being of laying hens. Her research emphasizes the importance of regular parasite monitoring and effective pest management to keep chickens healthy in cage-free housing systems.