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Perrygo travelled to the American Southwest to collect fossil specimens of large ground sloth species that roamed North America until about 11, years ago. Details of their travels and efforts are described in their field books.
In a field book, sixth Secretary of the Smithsonian and ornithologist Alexander Wetmore describes excavating sloth bones in Costa Rica. In a photo album from from when he was working in Panama, Wetmore describes and includes a photograph of a two-toed sloth that decided to visit the camp site one evening! In some of our more recent collections mid-twentieth century to present , there are many references to Smithsonian staff caring for sloths and studying and documenting their behavior.
McCrane became the first person ever to successfully hand-rear a two-toed sloth , which included having the baby sloth attached to her for long periods of time, reminiscent of the months that baby sloths remain attached to their mothers in the wild. She later published her experiences to assist those who might find themselves in a similar situation in the future.
From , resident scientist at the Zoo John F. Eisenberg directed a long-term project on sloth research in Panama. During her nearly year career as a biologist with the Zoo, Dr. Devra Kleiman dedicated her professional career to researching animal behavior, most famously in her work with giant pandas and golden lion tamarins. An extensive documenter of her work in both written and audiovisual formats, Kleiman also participated in several field studies from the s through the mids.
Some of her field books from these trips can be viewed in the Smithsonian Transcription Center.
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