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Round Island Boa Reintroduction – Back in Wild after a 150-Year Absence

Casarea dussumieriMauritius, an island nation off the coast of southeast Africa, is best known to naturalists as the site of the Dodo Bird’s extinction (Mauritius also is, in a sense, the reason I was hired by the Bronx Zoo and spared life as a lawyer – see article below for the story!).  Herp enthusiasts, however, know it as the habitat of several unique reptiles, all of which are now very rare or extinct. But we can delight in some news just released by the Durrell Wildlife Trust – a new population of the Round Island or Keel-scaled Boas, Casarea dussumieri, will soon be established in the wild.  This unusual snake disappeared from nearly all of its range in the 1860’s, and its return is the culmination of 40 years’ worth of captive breeding and habitat restoration efforts.

Status and Conservation

The Round Island Boa is now confined to Round Island, a tiny speck of habitat where perhaps 500-1,000 individuals survive.  A single wild population and limited number of captives place it at continued risk of extinction.  The new population to be established on another Mauritian island (where the snake formerly lived) is a vital step towards ensuring the species’ survival. 

Phelsuma ornataThe Durrell Wildlife Trust became the first institution to breed the Round Island Boa, and maintains most of the captive population.  Founded by legendary conservationist and author Gerard Durrell, this unique organization focuses on critically endangered animals and plants, especially those overshadowed by pandas, rhinos and other “charismatic mega-vertebrates”.  The Trust was the first to breed the Giant Jumping Rat, Lesser Antilles Iguana, Flat-tailed Tortoise and scores of others (please see article below).

The Reintroduction

The island selected for the new Round Island Boa population has been cleared of the introduced black rats, goats and rabbits that previously destroyed the habitat and prey base. The snake’s primary food, the Telfair’s Skink (Leiolopisma telfairi), was released on the island in 2007 and is now well-established. Like other Mauritian reptiles, Telfair’s Skink has been eliminated from much of its range, but survives on Round Island and at the Durrell Wildlife Trust.

The boas to be reintroduced were collected from Round Island, and will first be monitored to assure that they are genetically diverse and disease-free.

Round Island Boa Natural History

Although originally placed in the genus Boa, this species differs so greatly from seemingly-related snakes that is now classified in its own genus and family (Bolyeridae).  The family’s only other member, the Round Island Burrowing Boa (Bolyeria multacarinata), has not been seen since 1975 and is presumed extinct.

The Round Island Boa is oviparous, and changes in color from bright orange to grayish-brown as it matures.  There are some indications that females remain with their eggs for a time.  Unique scalation lends the alternative common name of Keel-scaled Boa.  Juveniles and some adults (especially females) appear to be largely arboreal.

The Round Island Boa’s preferred habitat – forest and palm-dotted savannah – has been largely reduced to brushy scrub by agricultural development, introduced rabbits and goats.  Rat predation on young snakes and skinks has contributed to the species’ drastic decline. 

What’s Next?

Casarea dussumieriThe reintroduced population will be closely monitored by Durrell Wildlife Trust staffers and other conservation organizations. In addition to establishing a new population, the project may serve as a template for future herp recovery efforts.  I’ll post updates as they become available.

There are many other success stories, as well as failures.  Please post your own thoughts and examples below so that I can share them with readers and researchers.  Thanks.


Further Reading

Round Island Boa photos and information

How Mauritius Pink Pigeons Saved Me From Life as a Lawyer

The Durrell Wildlife Trust

Telfair’s Skink Natural History



Casarea dussumieri image referenced from wikipedia and originally posted by Jjargoud

Phelsuma ornata image referenced from wikipedia and originally posted by Mark J. Harmon

Valley in Mauritius image referenced from wikipedia and originally posted by line1

About Frank Indiviglio

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Being born with a deep interest in animals might seem unfortunate for a native Bronxite , but my family encouraged my interest and the menagerie that sprung from it. Jobs with pet stores and importers had me caring for a fantastic assortment of reptiles and amphibians. After a detour as a lawyer, I was hired as a Bronx Zoo animal keeper and was soon caring for gharials, goliath frogs, king cobras and everything in-between. Research has taken me in pursuit of anacondas, Orinoco crocodiles and other animals in locales ranging from Venezuela’s llanos to Tortuguero’s beaches. Now, after 20+ years with the Bronx Zoo, I am a consultant for several zoos and museums. I have spent time in Japan, and often exchange ideas with zoologists there. I have written books on salamanders, geckos and other “herps”, discussed reptile-keeping on television and presented papers at conferences. A Master’s Degree in biology has led to teaching opportunities. My work puts me in contact with thousands of hobbyists keeping an array of pets. Without fail, I have learned much from them and hope, dear readers, that you will be generous in sharing your thoughts on this blog and web site. For a complete biography of my experience click here.
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