I have (I believe) a more symbiotic relationship in my garden than any of those. A chicken and a pony. The pony likes to lie down when the chicken is around to keep watch and she purposely drops chewed up carrot for the chick, they work well together.
@GeniUs I've seen birds grooming the hair of horses and sheep and taking out any bugs and riding around on them, both happy with each others presence and so many other things in animals. This was just a random visit to Google images.
