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People have a deep desire to communicate with animals, as is evident from the way they converse with their dogs, enjoy myths about talking animals or devote lifetimes to teaching chimpanzees how to speak. A delicate, if tiny, step has now been taken toward the real thing: the creation of a mouse with a human gene for language.

The gene, FOXP2, was identified in 1998 as the cause of a subtle speech defect in a large London family, half of whose members have difficulties with articulation and grammar. All those affected inherited a disrupted version of the gene from one parent. FOXP2 quickly attracted the attention of evolutionary biologists because other animals also possess the gene, and the human version differs significantly in its DNA sequence from those of mice and chimpanzees, just as might be expected for a gene sculpted by natural selection to play an important role in language.

Researchers at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, have now genetically engineered a strain of mice whose FOXP2 gene has been swapped out for the...