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I study sloths, and as popular as they have become on the internet, the thing most people do not realize is that we are living in a world majorly deprived of most types of sloth. Today there are only two types of sloths: two-fingered (genus Choloepus) and three-fingered (genus Bradypus). (You may have heard them referred to a two-toed and three-toed, but they both have three digits on their hind limb, so the difference is on the forelimb, in other words, their hand, hence: fingers.) There are only a few species of each kind of sloth and they all live in the trees of tropical rainforests in Central and South America.

But back in prehistoric times, there were many types of sloths: more than 80 genera across five different families. They lived as far north as the Yukon Territory and Alaska, as far south as Patagonia, and stretched from coast to coast in the United States and even colonized islands throughout the Caribbean. The smallest of these fossil sloths were still bigger than any sloth alive today, and the biggest extinct sloths were the size of modern elephants (but could probably walk around on two legs like an awkward bear). All this means there is a lot to learn about the sloths that are no longer with us.

On the BHL blog, we often focus on the extensive biodiversity information made available through BHL and the innovative ways scientists are using the vast quantities of historical biodiversity data in BHL to conduct contemporary research. BHL is also useful for a range of non-scientific research, however, and is used by researchers in the arts and humanities as well as the sciences. Artists draw on the illustrations for inspiration, while humanities scholars use the digitised collections for historical research.

For librarians and book historians, BHL contains a wealth of provenance information, as well as the material to conduct comparative research. As a librarian in charge of a rare book collection specialising in natural history, I often use BHL to check if our copy of an item is complete, bound in the usual manner, or coloured in the same way as other copies.

The family Syrphidae, commonly called hover flies or flower flies, include some 6,000 living species. As “one of the most abundant groups of flower visiting insects”, with adults of most species feeding almost exclusively on pollen and nectar or honeydew, these flies are among the most important pollinators, both for wild plants and numerous crops.

The multi-volume Diptères exotiques nouveaux ou peu connus (1838-[43]) by Justin Macquart contains the first descriptions of numerous Diptera species, including many members of the Syrphidae. Systema Dipterorum, the biosystematic database of world Diptera, attributes 430 Syrphidae names to Macquart.

“Macquart wrote so many early Syrphidae genus and species descriptions that it’s almost impossible to write a syrphid taxonomic paper without referencing this title at some point,” explains Dr. Andrew D. Young.

Young is a University of California, Davis postdoc, working out of the California Department of Food and Agriculture Plant Pest Diagnostics Center, where he specializes in Diptera taxonomy and phylogenetics. Although he studies Tephritidae (fruit flies) in his current position, most of Young’s entomological training has been focused on Syrphidae. While Macquart’s monographic series is an essential resource for this group, it’s not easy to come by.

“Each volume is several hundred pages, and was published in the mid 1800s, so hardcopies are not particularly easy to get ahold of,” explains Young. “Most of the time when you do find a hardcopy, it’s one that’s been photocopied so many times it’s barely legible.”

Fortunately, Diptères exotiques nouveaux ou peu connus is freely available on the Biodiversity Heritage Library (BHL).

Twitter is a popular communication channel amongst the scientific community. Scientists use the platform to communicate with colleagues and share their research findings with both other scientists and the public.

Twitter may also be a valuable source of data for researchers. For example, ecologists from the University of Gloucestershire found that “Twitter-mined” data is useful for phenological studies, such as winged-ant emergence or the appearance of house spiders in the fall.

Twitter conversations can also spark unexpected discoveries. For example, a recent @BioDivLibrary Twitter conversation helped uncover a connection between the scientific literature and a museum’s collections.

Charles Darwin’s Library is a digital edition and virtual reconstruction of the surviving books owned by Charles Darwin. Produced as a collaboration between BHL, Cambridge University Library, the Library & Archives of the Natural History Museum in London, and the Darwin Manuscripts Project, the collection draws on original copies and surrogates from other libraries and includes over 500 of the 1,480 books in Darwin’s library. Notably, these books are complemented with fully-indexed transcriptions of Darwin’s annotations.

Charles Darwin’s Library is particularly meaningful to Dr. B. Ricardo Brown, Professor of Social Science and Cultural Studies at the Pratt Institute. Brown has devoted years of research to Darwin and the impact of his evolutionary theories on debates around monogenetic vs. polygenetic human origins. Brown’s 2010 book, Until Darwin: Science, Human Variety and the Origin of Race, explores the complex web of factors that influenced these debates from the 17th-19th centuries and the impact of the publication of On the Origin of Species on this scientific discourse.

Brown spent nearly 10 years researching this book. Today, BHL’s open access collections offer researchers considerable time-savings.

“I am sure that if I had the kind of access to texts that BHL now provides researchers, I could have reduced the research time for Until Darwin in half,” muses Brown.

Each year, audiences around the world are gripped with “shark mania”. Since its premier in 1988, the annual Shark Week celebrations have resulted in countless hours of programming devoted to all things sharks.

During Shark Week 2017, Vox posted a story with a video explaining why you don’t see Great White Sharks in aquariums. At the end, video co-creator Joss Fong highlighted the Biodiversity Heritage Library (BHL) as a “great resource” for historic literature on biodiversity — and gave a shout-out to BHL’s Flickr collection: “Sharks, Skates & Rays!”. The collection includes illustrations dating back to the sixteenth and seventeenth centuries.

Danielle Alesi, a PhD candidate at the University of Nebraska-Lincoln (UNL), stumbled upon the video one night last summer while taking a break from studying for her comprehensive exams. She was introduced to BHL for the first time.

This blog post is the first in a series from Smithsonian Libraries highlighting Unearthed, a new BHL collection of paleobiology literature curated by Smithsonian Libraries in celebration of the opening of the National Museum of Natural History’s David H. Koch Hall of Fossils – Deep Time exhibit. Additional posts will publish throughout 2019, so check back regularly for more fossil fun. Explore the Unearthed collection today.