I always thought they didn’t, and then saw a nature film of ostriches Doing It. It sure looked like the male had a willie hanging down afterwards. Besides, if they didn’t have 'em, (1) how is sperm transmitted? and (2) it sure sounds like a dull way of doing things . . .
If you know the answer (Which is Yes they do) why are you asking the question?
pepperlandgirl: Because I am not sure what I saw was actually a penis. It was not shaped at all like your more conventional appendages seen on mammals; I’m puzzled. I’ve never seen anything similar after seeing pigeons Do It, and pigeons do seem to Do It a lot with a brazen disregard for spectators.
I learned a little too much about bird reproduction awhile back while trying to settle this very debate at work (it was a slow day). The answer is that birds have an organ called the cloaca, a “A common chamber receiving digestive wastes and urogenital products (urine and gametes); common in most vertebrates except mammals.” (http://www-biol.paisley.ac.uk/courses/tatner/biomedia/glossary/glossary.htm#cloaca)
"Sperm passes out of the testis into a duct ( the vas deferens) which expands near the cloaca into a storage organ. During copulation, the cloaca is everted and semen is deposited in the female’s cloaca.
“( In some birds, such as the Anseriformes, Tinamidae, Cracidae, and the ratites, males have a penis-like organ.)” (http://www-biol.paisley.ac.uk/courses/tatner/biomedia/units/bird9.htm)
Hope this helps 
And now for some fun facts. According to Ehrlich, Dobkin and Wheye (Birder’s Handbook), “Unlike the testes of mammals, those of birds vary greatly in size with the seasons. During the breeding season they may be several hundred times larger than they are during the rest of the year and can account for as much as a tenth of the male’s body weight.”
Passerines (songbirds like warblers and crows) don’t have a penis but the cloaca enlarges during the breeding season. In fact, this is one thing I look for when trying to sex birds (a “cloacal protruberance” for males and a “brood patch” for females). When passerines mate, they briefly press their cloacas together, something we like to call a “cloacal kiss.”
Some birds mate once to produce their brood. Others (like Goshawks) can mate several hundred times. May be brief but it doesn’t sound boring.
You know, for the first time, I think I am glad the Mods turned the [IMG] tags off.
YUCK!
brachy comes through again!
Ten percent of the male’s body weight?!
I’ve got some catching up to do.
Maybe you just need to lose a little weight!
No, really. Don’t click it.
This bird does.
I warned you.
Anseriformes: Swans, geese, ducks.
Tinamidae and Cracidae: two families of large South American game birds, the tinamous and chachalacas.
Ratites: large flightless birds, including the ostrich, rheas, cassowaries, and emu.
TheNerd: That’s gross! ROFLOL!
Gr8Kat: Thanks for the biology lesson. An inverted digestive tract/cloaca is indeed what the ostrich’s appendage looked like.
brachyrhynchos: Thanks for the avian gonad update. Although I’m a very amateur bird-watcher, I always thought those crows had a lot of balls. Now you’ve got me wondering about the sex life of reptiles. The males seem no more well-equipped than do birds, so I have to suppose they have similar apparati?
This reminds me of the one about the traveling salesman and the farmer’s daughter.
The salesman’s car breaks down on a lonely country road one night and he makes his way to the nearest farmhouse to ask if he can spend the night. The farmer says, well, ain’t got but one bed where my daughter sleeps, but, mind you, no hanky-panky!
When the salesman and the farmer’s nubile daughter got into bed, the farmer placed a row of eggs on the mattress between them to ensure they wouldn’t couple. But of course, they wound up doing what comes naturally all the same, and completely smashed all the eggs. The salesman sat up the rest of the night gluing the eggshells back together.
At sunrise the farmer came into the bedroom and picked up all the eggs. “Let’s go have breakfast.” He cracked one egg over the frying pan. Nothing. He tried another. Nothing. All the eggshells were empty. The farmer was furious! He grabbed up his shotgun and where do you think he ran?
Into the henhouse! He pointed his gun at the roosters and said, “O.K., which one of you guys used a rubber?”