Surprisingly birds have sex very similarly to the way which most mammals do, with the male mounting the female from behind and inserting sperm into the female with the avian equivilant of a penis.
Some birds mate on the ground, chickens and grouse and pheasants obviously, but also "English Sparrows," they cause quite a ruckus, a flurry of flapping and chitterings of a group of males 'fighting' and chasing a female, somewhere in all that commotion a mating or more than one takes pla...

Surprisingly birds have sex very similarly to the way which most mammals do, with the male mounting the female from behind and inserting sperm into the female with the avian equivilant of a penis.
Some birds mate on the ground, chickens and grouse and pheasants obviously, but also "English Sparrows," they cause quite a ruckus, a flurry of flapping and chitterings of a group of males 'fighting' and chasing a female, somewhere in all that commotion a mating or more than one takes place.
Some water fowl, especially them big white ducks at the park, mate in the water. The drake (male) climbs on the back of the duck (uhh, a female duck is called a duck), she starts sinking and trying to get away with a lot of squawking and wing flapping, the drake grabs aholt of the feathers on the back of her head and neck so he don't get tossed off. In crowded ponds, which is typical in city parks where people think they can get rid of the "Easter ducklings," some females are picked bald before mating season is over and some even die of exhaustion.
Some birds mate in the air, swifts do, and some raptors. Falcon females climb higher and higher and the males try to get above her. If one does he settles on her back and they plummet towards the earth as they mate.
Eagles and some other birds build nests high in the trees that are way too big for the purpose of raising young. The male starts the nest trying to impress the female with his handyman skills, then they both start working and add to it year after year. They use the big wide top as a mating area.
I direct your attention to The Life of Birds by David Attenborough or any of Roger Tory Peterson's Field Guide to the Birds.
birds have only one "hole," ' more correctly called the vent, which is the opening into the cloaca. The cloaca is basically a sac into which the urinary, alimentary, and reproductive systems open. In the case of males the reproductive system ends at a phallus in side the cloaca,
In many birds this phallus never extends beyond the vent, in that case the birds do mate with the 'cloacal kiss.' This kiss varies in duration among various species, sometimes an instantaneous 'peck', as with the 'fighting' sparrows, in others a longer time, as when eagles mate on the nest platform. Other birds have a phallus that can extend beyond the cloaca, as in the ducks, an external phallus is usually called a penis. Check these links; http://www.abc.net.au/.../...u...
http://news.nationalgeographic...
http://www.bbc.co.uk/nature/an...
which describe a South American Duck that apparently "runs around with its seventeen inch penis hanging out."
Males have two functional internal testes that send sperm to the mouth of the cloaca. Females have one functional and one rudimentary ovum.

the male or the female [not sure] go on the other birds back and they mate