Their babies would inherit varying degrees of `fit' coats or beaks, and again the fittest of all would be selected in competition.
(Their babies; would inherit; varying degrees of `fit' coats or beaks) (the fittest of all; would be selected; L:in competition; T:again)
Their babies the fittest of all
would inherit would be selected
varying degrees of `fit' coats or beaks
L:in competition T:again