This is usually a good sign which means it is happy and content. It can also be singing to another bird which it has chosen for a mate or singing for your attention and approval.
did you mean cocktail...
I have a cockatiel named Petie he is smart pretty and obedient and talented
The cockatiel is a type of Australian parrot.
It means it's frightened. A cockatiel sitting with its back to you is not usually frightened, as a frightened bird is more likely to flap and cower in a corner, keeping its eyes on you, rather than turning its back to you, which would render it vulnerable to predation. If a cockatiel sits with its back to you, it can mean the bird is distressed or ill. It can also mean the bird is, quite simply, sulking. Cockatiels bond strongly to their owners, and if a new pet is introduced, or something unusual happens in the household, a cockatiel will sometimes react in a seemingly human way - by sulking.
Cockatiel females are fertilized internally.
I don't see how you could, but if you mean by the neck, that is a very bad idea!
it could mean that he is listening to something. could also because he is sneezing.
that they are still alive and they still need heat and that they will still hatch eventually.
if by sings bass you mean a bass player that sings, then paul McCartney with the beatles.
There is no such thing as the biggest cockatiel beacause all cockatiel are small but cockatiels are from the cockatoo family, so its relative ( the cockatoo) will be the biggest.
If you mean 'Who sings Black Sabbath,' the answer is Black Sabbath. If you mean who sings on it, Ozzy Osbourne. If you mean who sings for Black Sabbath, Ozzy Osbourne then Ronnie James Dio then Ian Gillan then Glenn Hughes then Tony Martin.
When a cockatiel flairs its tails and shows its wings, it means that something has frightened it. It is trying to make itself look big and threatening so that whatever it is afraid of will go away.