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In the study looked at, we called the nestlings, living in temperatures between 31 to 45 degrees C. We just wanted to see the relationship between the temperature and the portion of the bird's DNA, telomeres. Telomeres are these are endpoints in the DNA that act as seals to protect the cell. So when the telomeres, when the DNA gets shorter and shorter and shorter, the cells die off. So the telomeres help the DNA to stay intact longer. So once they erode to a certain level, the cell shuts down and the cells begin to build up. As they begin to build up, the aging process accelerates. And nestlings expose the hot, dry environment during the first few days of life, had shorter telomeres. Stop it.