Evolution doesn't explain language ability

Claim

Evolution does not explain the evolution of language ability.

Yahya, Harun, 2004. Errors concerning human intelligence on the BBC's Horizon programme. [1]
Anon, 1985. Life--How Did It Get Here?, Watchtower Bible and Tract Society of New York, Inc., pp. 174-175
Gitt, Werner, 1993. Did God Use Evolution?, p. 33

Virtually all animals have the ability to communicate with each other, using all manner of methods, including pheromones, scents, sounds, scratches, and color-changes in different combinations depending on the species.
Evolution explains language exactly the same way it explains everything else: mutations which contribute to a useful ability (such as language) are preserved by natural selection in organisms for whom such an ability enhances reproductive success. It is very easy to see how the language ability enhances the odds of survival and, thus, reproductive success.
Language doesn't fossilise so the exact pathway taken by the evolution of language may not be discoverable after all this time; however several plausible pathways have been proposed.
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Mark Isaak's page for this claim [2]
Crow, Tim J. (April 6, 2000). Putative location and identity of the gene for cerebral asymmetry and language.
Oesch, Nathaniel Tillman. The Adaptive Significance of Human Language. University of Tennessee, Knoxville.
Pinker, Steven & Bloom, Paul (1990). NATURAL LANGUAGE AND NATURAL SELECTION. Massachusetts Institute of Technology.
Martin A.Nowak and Natalia L. Komarova Language (July, 2001). Towards an evolutionary theory of language. TRENDS in Cognitive Sciences Vol.5 No.7.
Dessalles, Jean-Louis. GENERALISED SIGNALLING: A POSSIBLE SOLUTION TO THE PARADOX OF LANGUAGE.