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