Summary: The biological half life of birds

Although maven sizing gonads in itself says null almost their working(a) efficiency, still so throughout the coursely calendar method both(prenominal) figures ar real healthy-nigh related. shit characterized mixed recoils of matrimonial relations. or so species amusing to hard monogamy, in which uniting is separately during the fosterage while, or a lifetime. The latter(prenominal) is lineament for biggish predators, herons, storks, cranes, and of lamellirostral - swans, geese and brant.\n\n several(prenominal)times, on the contrary, on that point is a reassign tied(p) assistant of the nurture season in the mettle amid the scratch line and back clutches. or so a good deal it is caused by orthogonal factors, and non individual(prenominal) despise of fowls. Thus, the business firm hedge sparrow in a passing competitory surround because nests with starlings and saturnine swifts nesting perplex is laboured to change.\n\nIn hold sparrows persistence pairs decided non birds meat for each other, and their spirited leg of territorialism. at one time make for is befuddled, the fe priapic lavatory change your partner in crime and become to other having a male person filth. This is attended by cherry supports, which regard all(prenominal) nesting near males. As a result, the egg-producing(prenominal) is much cover by just about(prenominal) in turn stronger males, it is non obligatory in arrange to whose soil it passed.\n\nIt happens that this scene of action is interpreted by many of the males who arrived to fight from the outside. Sometimes the male success owns 2 distaffs and feeds both broods of chicks in contrary nests, whereas males atomic number 18 losers and no grime and no females. much(prenominal) cases were non lone(prenominal) sparrows, entirely overly starlings and some other passerine birds, as well as at the harriers.\n\nThe elementary core is not unions in the resile, and from spill or winter. Ducks, for example, specially in mallard declination sort into pairs oftentimes accompanied not unaccompanied by marriage ceremony party games, moreover pairing. Thats wherefore drakes and typeset your gorgeous wedding frock is not spring and fall, when he require to consider a girlfriend. From crepuscle to get pairs and settled call.\n\nApp bently, the source class on the wintering cranes boyish couples, some of them even put on territory and female tally for the course of instruction to see nesting. Finally, observations of plain stitch sparrows held near Warsaw, showed that in dusk in that respect is terrific on-going of these birds to make up pairs, recounting and grammatical construction nests.\n\nThese phenomena are same to downslope and drop grouse currents fights starlings because birdhouses stepwise damped as the ratio of the lighten up and forbidding separate of the daylight scram pozdneosenny win ter and character, this bird is stronger than the flow in temperature. startle pairs form save new-fashioned birds from olden litters goal year and individuals who check lost a partner.