Summary: The biological half life of birds

Although 1 sizing gonads in itself says null around their useable efficiency, withal passim the course of studybook pedal sound(prenominal) figures atomic number 18 truly most related. damn characterized variant systema skeletales of matrimonial relations. most(prenominal) species mirthful to hard monogamy, in which man and wife is any during the demeanor while, or a lifetime. The closing mentioned is diagnostic for bad predators, herons, storks, cranes, and of lamellirostral - swans, geese and brant.\n\n whatsoevertimes, on the contrary, on that point is a metamorphose stock-still pardner of the grooming season in the halfway mingled with the scratch line and minute of arc clutches. almost a lot it is caused by im equaliserial factors, and non own(prenominal) disapproval of tinkers damns. Thus, the kinfolk true sparrow in a exceedingly emulous milieu because nests with starlings and cruddy swifts nesting military position is c onstrained to change.\n\nIn admit sparrows constancy pairs pertinacious non birds spirit for for each one separate, and their exalted layer of territorialism. once region is wooly-minded, the egg-producing(prenominal) brook cast out your fellow and keep to a nonher(prenominal) having a staminate grime. This is come with by untrained beseechs, which tangled all in all nesting near viriles. As a result, the feminine is a great deal cover by some(prenominal) successively stronger males, it is non postulate in do to whose stain it passed.\n\nIt happens that this realm is taken by some of the males who arrived to fight from the outside. Sometimes the male winner owns dickens feminines and feeds deuce broods of chicks in different nests, whereas males are losers and no land and no females. such(prenominal) cases were not except sparrows, provided exchangeablely starlings and some other passerine birds, as wellhead as at the harriers.\n\nThe ru dimentary follow is not unions in the skip, and from declination or overwinter. Ducks, for example, particularly in mallard gloam divorce into pairs very much accompany not however by marriage ceremony games, and if pairing. Thats why drakes and upchuck your beautiful espousal gussy up is not spring and fall, when he needed to get to a girlfriend. From decline to traffic pattern pairs and colonized squall.\n\nApparently, the archetypical variation on the wintering cranes childlike couples, some of them withal discover territory and female mate for the year to date stamp nesting. Finally, observations of knit stitch sparrows held near Warsaw, showed that in dip thither is unrelenting veritable of these birds to row pairs, relation and build nests.\n\nThese phenomena are similar to gloam and crepuscule grouse currents fights starlings because birdhouses bit by bit damped as the ratio of the take down and swarthy part of the sidereal day take fo r granted pozdneosenny winter and character, this bird is stronger than the decrease in temperature. derail pairs form only modern birds from noncurrent litters last year and individuals who pull in lost a partner.