Parsley is very good for animals aside from birds.  It is poisonous to most birds.  It is good for curing foot rot in sheep and goats.  Parsley is used in Spain to bring sheep into heat during any season of the year.

Parsley provides some very unique health benefits due to its multiple volatile oil components and flavonoids.  Parsley's volatile oils have been shown to inhibit tumor formation and particularly tumor formation in the lungs. The activity of parsley's volatile oils qualifies it as a "chemoprotective" food that can help neutralize particular types of carcinogens (like the benzopyrenes that are part of cigarette smoke and charcoal smoke).

The flavonoids in parsley function as antioxidants that combine with highly reactive oxygen-containing molecules and help prevent oxygen-based damage to cells.  

Parsley is a wonderfully nutritious storehouse of nutrients that should not be overlooked.  It is an excellent source of vitamin C as well as a good source of vitamin A and folate. It can lower our risk of cancer, enhance our immune system, reduce inflammation and so much more.  Parsley is rich in apigenin which has been shown to reduce skin, breast and prostate cancers as well as boost the production of a liver enzyme which can detoxify our bodies.  It acts as an anti-inflammatory and antioxidant and has been proven to suppress over-stimulated immune responses, which makes it a crucial player in the fight against allergies, autoimmune and persistent inflammatory disorders.  Parsley is also recommended as an antibiotic alternative to be used at the first signs of urinary tract infection.