08 December 2009

Lack might be right

Crossner manipulated brood sizes in field. He had two groups, one natural and one with an unlimited food supply. He found the body weight of fledglings was more or less equal in those with unlimited food, but highly variable in the other group.

OTHER RESEARCH HAS SHOWN THAT BIRDS NORMALLY PRODUCE SLIGHTLY LESS THAN THE "OPTIMUM NUMBER".


Barn Owl

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