This is correlated with smaller bursae of Fabricius , glands associated with antibody production, and a lower fecundity of the blood-sucking fly Carnus hemapterus that attacks nestlings. Students at coed schools tended to have gender-typical subject preferences: Ford then placed Newsweek briefly on hold before getting back on the phone to say the rally would no longer be held there. Captive birds often live longer than wild ones. When the female has reached peak weight, the male provides a ritual presentation of food and copulation occurs at the nest. This does not hold true for European males by contrast, where the spotting varies according to subspecies. Similar findings were reported by researchers at Cambridge University, who examined the effects of single-sex classrooms in schools in four different neighborhoods, including rural, suburban and inner-city schools. Unmated males without family responsibilities often start losing feathers earlier in the year. They also found that students in single-sex schools have a significantly more positive attitude toward learning. Girls at single-sex schools attain the highest achievement; boys at single-sex schools are next; boys at coed schools are next; and girls at coed schools do worst of all.
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