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Egg wars

Birds engage in evolutionary arms race

Eggs of cuckoo finches and tawny-flanked prinias have grown more colorful in the last 40 years — a sign that the neighbors are locked in an evolutionary arms race.

African cuckoo finches (Anomalospiza imberbis) dump their eggs into the nests of tawny-flanked prinias (Prinia subflava). By laying eggs that mimic prinia clutches, cuckoo finches trick the prinia into caring for the finch young.

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