▁and ▁ 2 ▁c rows , ▁pied ▁crow ▁and ▁Cape ▁crow . ▁ ▁The ▁great ▁sp otted ▁c uck oo ▁exhib its ▁bro od ▁par as it ism ▁by ▁lay ing ▁a ▁m im icked ▁version ▁of ▁the ▁mag pie ▁egg ▁in ▁the ▁mag pie ' s ▁nest . ▁Since ▁c uck oo ▁eggs ▁h atch ▁before ▁mag pie ▁eggs , ▁mag pie ▁h atch lings ▁must ▁comp ete ▁with ▁c uck oo ▁h atch lings ▁for ▁resources ▁provided ▁by ▁the ▁mag pie ▁mother . ▁This ▁relationship ▁between ▁the ▁c uck oo ▁and ▁the ▁mag pie ▁in ▁various ▁locations ▁can ▁be ▁character ized ▁as ▁either ▁recently ▁sym pat ric ▁or ▁anci ently ▁sym pat ric . ▁The ▁results ▁of ▁an ▁experiment ▁by ▁Sol er ▁and ▁Mol ler ▁( 1 9 9 0 ) ▁showed ▁that ▁in ▁areas ▁of ▁ancient ▁sym pat ry ▁( species ▁in ▁coh ab itation ▁for ▁many ▁gener ations ), ▁mag p ies ▁were ▁more ▁likely ▁to ▁reject ▁most ▁of ▁the ▁c uck oo ▁eggs , ▁as ▁these ▁mag p ies ▁had ▁developed ▁counter - ada pt ations ▁that ▁aid ▁in ▁identification ▁of ▁egg ▁type . ▁In ▁areas ▁of ▁recent ▁sym pat ry , ▁mag p ies ▁rejected ▁compar atively ▁fewer ▁c uck oo ▁eggs . ▁Thus , ▁sym pat ry ▁can ▁cause ▁co e volution , ▁by ▁which ▁both ▁species ▁under go ▁gen etic ▁changes ▁due ▁to ▁the ▁select ive ▁press ures ▁that ▁one ▁species ▁ex ert s ▁on ▁the ▁other . ▁ ▁Ac rom y rm ex ▁ant