in agriculture, humans harvest bird droppings for use as fertilizer. these droppings have a high content of nitrogen, phosphate, and potassium, three nutrients essential for plant growth.
chickens are also used as an early warning system of human diseases, such as west nile virus. mosquitoes carry the west nile virus, bite young chickens and other birds, and infect them with the virus. when chickens or other birds become infected, humans may also become infected in the near future.
birds have important cultural relationships with humans. birds are common pets in the western world. common bird pets include canaries, parrots, finches, and parakeets. sometimes, people act cooperatively with birds. for example, the borana people in africa use birds to guide them to honey that they use in food.
birds also play prominent and diverse roles in folklore, religion, and popular culture. they have been featured in art since prehistoric times, when they appeared in early cave paintings. many young child know of big bird, a very large canary of sesame street fame.
feathers are also used all over the world to stuff pillows, mattresses, sleeping bags, coats, and quilting. goose feathers are preferred because they are soft. manufacturers often mix goose feathers with down feathers to provide extra softness