Hi Melody,
It does sound like you may have two females. But you may also have an immature male, or a male who is just not compatible with the female. Depending on the mutation, you can tell the gender of many cockatiels by feather coloration or markings. You might want to do some research on this if you haven’t already.
As for the female with the eggs, you can let her keep the eggs, but don’t give her a nest or anything she can use as a nest. Leave the eggs on the cage floor. Do not give her any nesting material or anything she can use as nesting materials. Clean the cage as usual and maintain the usual routine. All of this is the opposite of what you would do for a breeding bird because in this case you don’t want to encourage her to lay eggs or she may become a chronic egg layer and this will eventually compromise her health. Watch both birds carefully for excessive aggression. If they fight too much or if her attacks on the other bird get vicious, you will have to split them up. A female on eggs can be very territorial and protective of the eggs and she can injure or kill the other bird. Let her keep the eggs for about 3 weeks unless she eats them or discards them earlier, then throw the eggs away.
Thank you for asking Lafeber,
Brenda
