In January 1991 (often listed as 1990), Charles Sibley and Ahlquist published Phylogeny and Classification of Birds, which presented a new phylogeny for birds based on DNA-DNA hybridisation techniques, known as the Sibley-Ahlquist taxonomy.
En xaneiro de 1991 (a miúido citada como de 1990), Charles Sibley e Ahlquist publcaron Phylogeny and Classification of Birds, na que presentaban unha nova filoxenia pra as aves baseada nas técnicas de hibridación ADN-ADN, coñecida como a Taxonomía de Sibley-Ahlquist.