On the basis of long-term researches (1968–2000) the features of use by different species Shorebirds and a Waterfowl of special Adaptation – raising of a nest on a measure of rise of a water level are analyzed. It is shown, that on the basis of features of reaction of different species it is confidently allocated eight levels of this adaptation. For birds of all groups very wide norm of reaction to the influencing factor is characteristic. The order of division of species on groups reflects gradual increase in a share of reaction of high levels. At birds of first six groups the share of imperfect levels of reaction which use does not rescue a laying from flooding is great. The most perfect reaction is observed at birds of the last groups. In it obvious narrowing norm of reaction and its concentration in area of two most energetically favourable levels – the fourth both the fifth is observed. The most perfect and economical levels of reaction are marked among the birds nesting in extremely astable and changeable habitats constantly testing influence of the unstable water level.