A passerine is a bird of the order Passeriformes, which includes more than half of all bird species. They are songbirds which can perch. Most of them are small in size, and most can sing very well.
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Nutrition and fasting mimicking diets in the prevention and treatment of autoimmune diseases and immunosenescence. 1  a Longevity Institute, Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089, USA.