An unpaired hen will often go on to lay infertile eggs with little encouragement in the spring.

Let that console me for my sterile, infertile eggs, she thought, as she comforted her sole remaining partner and lover.

The pesticide interfered with the bird's calcium metabolism which resulted in thin-shelled, easily broken or infertile eggs.

In two or three days infertile eggs will begin to shrink, while fertile eggs may be stored as they are until hatching is imminent.

An unembryonated egg might be a trophic egg, probably (but not necessarily) unfertilised or at least infertile.

The female will then feed the tadpoles with infertile eggs that she lays into the water.

Can it be all that difficult to program a roach to lay infertile eggs?

All infertile white eggs must be discarded.

They can't have abandoned a cave because there's an infertile egg?

They mated with females, which produced infertile eggs.