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Brown Throated Sloth, Bradypus variegatus, femalePanama, Central America, Gamboa Reserve, Parque Nacional Soberania, hanging in tree feeding on leaves, three-toed sloth, The guard hairs are very coarse and stiff, and overlie a much softer layer of dense under-fur. The hairs are unusual in lacking a central medulla, and have numerous microscopic cracks across their surfaces. These cracks are host to a number of commensal species of algae, including Rufusia pillicola, Dictyococcus bradypodis, and Chlorococcum choloepodis