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The Megatherium Club was a group of Washington, D.C.-based scientists who were attracted to that city by the Smithsonian Institution's rapidly growing collection, from 1857 to 1866.

Many of the members had no formal education, but came by their expertise through extensive direct observation. They spent their weekdays in the rigorous and exacting work of describing and classifying species. But, their nights were spent in revelry. They particularly enjoyed partaking in ale, oysters, eggnog, and whatever other fineries their meager budgets could afford. On Sundays, however, they recuperated from the week's stresses and excesses with long nature hikes.

The club was named for the Megatherium, an extinct species of giant sloth. Members greeted one another with its imagined call of "How, How!"

The leading spirit of the club was marine biologist William Stimpson, who hosted its earliest meetings in his home. Members dubbed the place "The Stimpsonian." By 1863, though, Stimpson and others had taken up residence in the castle of the actual Smithsonian.

Club members were encouraged by Spencer Fullerton Baird, the institution's assistant secretary. And, they attracted a variety of learned speakers to their meetings, including Louis Agassiz, John Torrey, and John Cassin. But, they were eventually thrown-out of their castle suites by the institution's secretary, Joseph Henry, who disapproved of the way members held sack races in the Great Hall and periodically serenaded his daughters.

Membership was transitory as individuals undertook independent studies abroad, sometimes for years at a time. Formal meetings ceased about the year 1866 when Stimpson moved to Chicago to oversee that city's Academy of Science.

Since 1866, a new group called the "Megatherium Club - Acadia Chapter" was created at Acadia University in Wolfville, Nova Scotia by a circle of biology majors and one history major. In the forefathers' image, they frequently use the "How, How!" greeting, pursue revelry on a nightly basis, and serenade young women whenever feasible. These young scientists are also impressed with the creatures who roamed the earth millions of years ago.

• Henry Bryant
• James E. Cooper
• Edward Drinker Cope
• Theodore Gill
• Ferdinand Hayden
• Robert Kennicott
• Fielding Bradford Meek
• John Strong Newberry
• Henry Ulke
• Lawrence Humphrey Evers

Smithsonian Institute - Megatherium Club