| 1. | Birds are morelikely to lay infertile eggs when they are in unnatural circumstances.
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| 2. | It's mainly the behaviour that's the problem but laying infertile eggs is not good.
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| 3. | Can it be all that difficult to program a roach to lay infertile eggs?
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| 4. | My lovebird used to do the same thing, and then started laying infertile eggs.
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| 5. | We've gone through years of infertile eggs ."
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| 6. | An unpaired hen may go on to lay infertile eggs with little encouragement in the spring.
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| 7. | The pesticide interfered with the bird's calcium metabolism which resulted in thin-shelled, easily broken or infertile eggs.
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| 8. | One, on a skerry in the bay, held a single eaglet; the other nest contained an infertile egg.
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| 9. | Endangered terns in Buzzards Bay, Mass . exhibit " lesbian " tendencies _ females nesting together, brooding over mostly infertile eggs.
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| 10. | Males inspect eggs to remove diseased or infertile eggs, and aerates the clutch by fanning them with its pectoral and pelvic fins.
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