My lovebirds layed an egg?

today i noticed an egg at the bottom of the cage.they are masculine and female i got them from a lady who have said that they had 3 chicks in may.what do i do with the egg, she be running around the bottom with it but is not now
ask yourself these questions: do you want them to have chicks?
have you get the time for them?
the money needed if anything goes wrong?
willing to do the research on breeding them?

whether yes to these questions then buy a nest box for them to use.
if no after remove the egg and if she lays another try changing the toys in the round up around and adding new ones and if she still lays after leave the egg untill she has finished laying
Crazy,

There is a fifty fifty chance that it is fertile or infertile. But since they successfully laid three eggs that hatched, you most possible have a fertile egg. But since it was laid at the bottom of the cage, it is most predictable dead. You can try putting a small basket at the bottom of the cage and riddle it with bedding (aspen!) and put the egg in. The parents should start sitting and incubating it. They may lay more eggs, but try to get them to incubate the one they currently own.
Answers:    She's not using it for a reason.

Not in position, not comfortable, doesn't feel safe, blah blah blah.
Did the lady show you the chicks your birds supposedly have?
Did she (or could she) provide documentation?

Sorry to say.. not everyone is honest.
In an effort to make a sudden dollar people will tell you exactly what you want to hear.

Either means of access - something is not right.
This obviously isn't an ideal breeding situation for your bird or she wouldn't be laying eggs at the bottom of the coop.
You need to evaluate your breeding situation - this doesn't just miserable the nest box.
This means - the cage itself, its location, the diet, the vitamins and minerals supplemented, the protein content of their diet, the seasonal changes surrounded by protein availability and light which trigger breeding responses in most species of birds, THEN the nest conditions itself.

You don't just stick two birds within a PetSmart cage with a $6 wooden box and expect results like BLAM.
Impossible as this may come across - it's not THAT easy and uncomplicated.
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