"Not Entirely Defective" joke

A guy decides that he'd like to have a pet. While looking around in the pet shop, he spots a parrot sitting on a little perch but it doesn't have any feet or legs. "Geez, I wonder what happened to this poor parrot," the guy says out loud.
"I was born this way," says the parrot. "I'm a defective parrot."
"Ha," the guy laughs, "It sounded like the parrot actually understood what I said and answered me."
"I understood every single word," the parrot says. "I'm a highly intelligent, very well educated bird."
"Yeah?" the guy asks. "Then answer this: how do you hang onto your perch without any feet?"
"This is a little embarrassing, but since you asked I'll tell you," the parrot whispers. "I wrap my little parrot penis around this wooden bar, kind of like a little hook. You can't see it because of my feathers."
"Wow," says the guy. "You really can understand and answer, can't you?"
"I told you I could, didn't I?" the parrot says. "I speak English, French and Spanish. I can converse with reasonable competence on almost any subject: politics, religion, sports, physics, and philosophy. You really ought to buy me. I'm a great companion."
The guy looks at the price tag. $200. He says, "I can't afford that."
"Pssst," the parrot hisses, motioning the guy over with one wing. "Nobody wants me because I don't have any feet. You can get me for $20, just make an offer."
The guy offers 20 dollars and walks out with the parrot.
Several weeks pass. The parrot is sensational. He's funny, he's interesting, he's a great pal, he understands everything, sympathizes, gives good advice. The guy is thrilled.
One day the guy comes home from work and the parrot says, "Pssst," and motions him over with one wing. The guy goes up close to the cage.
"I don't know if I should tell you this or not," says the parrot, "but it's about your wife and the postman."
"What?" says the guy. "What?"
"Well," the parrot says, "when the postman came to the door today, your wife greeted him in a sheer nightgown and kissed him on the mouth."
"What happened then?" asks the guy.
"Then the postman came into the house, lifted up her nightgown and began petting her all over," the parrot says.
"My God!" the guy says. "Then what?"
"Then, he got down on his knees and began to lick her body, starting with her breasts slowly going down and down," reports the parrot.
The parrot pauses for a long time.
"What happened? What happened?" asks the frantic guy.
"I don't know," says the parrot. "My dick got hard and I fell off my perch."