You cannot. A female cockatiel needs a male cockatiel to mate with her before she will produce fertile eggs.
And incidentally, birds do not "fall pregnant".
A peacock is male and a peahen is the female. A peahen cannot get pregnant without mating. The process includes the birds mating and then the female laying eggs.
By mating with a male dog.
he is probably trying to attract her for mating reasons.
No, a female dog cannot reproduce without mating with a male dog.
Yes
No. Not unless it got pregnant before you bought it.
No A hamster is a mammal and needs the oposite sex to become pregnant
Most female birds regardless of species will lay eggs when they feel like it. Mating is not required.
No they can't, there needs to be a male and a female and there needs to be mating. However if you buy a female from a bad petshop then there is always a possibilty that she might be pregnant from being kept in with males while at the petshop.
yes they will fight
No, female peacocks do not get pregnant without intercourse. Female peacocks, or peahens, reproduce through mating with male peacocks, or peacocks. Licking male tears does not result in pregnancy in peafowl or any other species.
It's either that or an illness. Call your vet.