The one on top of the pub on Parrot Port. You jump on the vent to clog it (partly block the smoke). The parrot is on the palm tree at far right.
because to clog it
It's on top of the pub (on the chimney).
At Parrot Port, the "vent" is the chimney on the roof of Petey's Pirate Pub.
There is smoke coming from the chimney atop Petey's Pub. Stand on the cover there for a minute to partly block the smoke. Then the parrot can be found in the palm tree to the far right.
Clog the Vent in Parrot Port on Poptropica's Skull Dugery Island means to back up the chimney at the pub.:)
YOURSELF! Stand on it long enough to satisfy the parrot
You could clog the vent by standing on it for a few seconds until no smoke comes out and then you are free to find the parrot, which is on top of a palm tree on the far right.
After you first meet the parrot, he wants you to jump into the sea and then find him again, and he is on a window above the Trading Post. Now he will say "clog the vent and see where I went". Jump atop the ash cover on the chimney of Petey's Pub, which will partly block the smoke. Now the parrot is at the palm tree at the far right. (see related question)
You are probably going there at the wrong time. When you see the parrot on the barrels, jump into the sea (left) and return to find him near the roof. Then he says to clog the vent, and you stop the smoke for a few seconds from the chimney on top of the pub. Go right to the palm tree and he will send you to see the pirate (far left tower). There you can use the cracker (from inside pub, upper left) to call the parrot.
You need the cracker from Petey's Pirate Pub. It is at the upper left inside. Before you give it to the parrot you have to complete his challenges (jump in the sea, clog the vent). When he tells you to talk to the pirate, go to the tower then use the cracker (your character yells "Polly wanna cracker?"). The pirate gives you the map piece and both disappear when you leave the island.
skullduggery island!
Fort Ridley is the first place you go on Skullduggery Island. Its impossible to miss it.