pigeons

Pigeons carry several diseases such as Histoplasmosis of which can be fatal to humans and pets. Candidiasis Fungus, and Cryptococcus which is infectious. Pigeon droppings carry over 60 diseases that  affect the human nervous system. Pigeon droppings and feathers  contain allergens cause respiratory problems. Pigeons always come back to breed from where they were born at least 4 times during the year. Although loud distressed bird sounds, plastic owls, or fake snakes can deter pigeons for a short time, they are not effective in the long run as pigeons eventually realize that the sound or fake predator is not a threat to them.