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The male mallard , or drake , leaves the female when she begins incubation and forms a group with other males . " It 's gotta be a cash cow , " he says . Those of a more scientific persuasion can always argue that we just do n't know the data yet to construct a " scientific " theory explaining the phenomenon ( any phenomenon around which this kind of debate happens ) , while those of a more theological persuasion can always argue that there is a sentient , guiding force behind what behavior they seek to explain . For example , Escherichia coli strain 086 presents the B antigen , and this antigen is readily recognized by anti-B antibodies in blood type A and O people , protecting them from infection . They result when one type of tissue ( skin , liver , lung , whatever ) stops performing its regular function and begins to grow , usually usually at a faster pace than the rest of the tissue around it . Nesting normally begins in early to late April , with a peak in May . " There is a guy here who looks exactly like Jude Law , " he says . " says a tall , handsome stranger as he passes our table , spotting my husband .