Of all the birds that visit my feeders,
I think it is safe to say the Mourning Doves take most portraits. I think it has to do with their greediness a bit, they love the small bowl that only allows for one bird to feed at a time. If another bird approaches, they put the wing up and move around to protect the bounty. They can be overwhelming in numbers and appetite. But they are experts at being models for bird portraits, so that evens things out a bit.
