Profile: Angonoka Tortoise

Learn about the world's most endangered tortoise

Angonoka Tortoise (Geochelone yniphora
DEA/DANI-JESKE/De Agostini Picture Library/Getty Images

The angonoka tortoise (Astrochelys yniphora), also known as the ploughshare or Madagascar tortoise, is a critically endangered species that is endemic to Madagascar. These tortoises have unique shell colorations, a characteristic that makes them a sought-after commodity in the exotic pet trade. In March of 2013, These tortoises have unique shell colorations, a characteristic that makes them a sought-after commodity in the exotic pet trade.

In March of 2013, smugglers were caught transporting 54 live angonoka tortoises--nearly 13 percent of the entire remaining population--through the Thailand Airport.

"It is the world's most endangered tortoise," tortoise advocate Eric Goode said to CBS in a 2012 report on the ploughshare. "And it has an incredibly high price on its head. Asian countries love gold and this is a gold tortoise. And so literally, these are like gold bricks that one can pick up and sell."

Appearance

The angonoka tortoise's carapace (upper shell) is highly arched and mottled brown in color. The shell has with prominent, ridged growth rings on each scute (shell segment). The gular (foremost) scute of the plastron (lower shell) is narrow and extends forward between the front legs, curving upward toward the neck.

Size

Adult male carapace length can reach up to 17 inches.

Adult male average weight is 23 pounds.

Adult females carapace length can reach up to15 inches.

Adult female average weight is 19 pounds.

Habitat

The tortoise inhabits dry forests and bamboo-scrub habitats in the Baly Bay area of northwestern Madagascar, near the town of Soalala (including Baie de Baly National Park) where the elevation average 160 feet above sea level.

Diet

The angonoka tortoise grazes on grasses in open rocky areas of bamboo scrub.

It will also browse on shrubs, forbs, herbs, and dried bamboo leaves. In addition to plant material, the tortoise has also been observed eating the dried feces of bushpigs.

Reproduction

These tortoises are estimated to reach sexual maturity around 15 years of age. The reproductive season occurs from approximately January 15 to May 30, with both mating and egg hatching occurring at the onset of rainy seasons. A female tortoise can produce one to six eggs per clutch and up to four clutches every year.

Geographic Range

The angonoka tortoise is found only on the African island country of Madagascar.

Conservation Status

Critically Endangered

Estimated Population

Approximately 400 individuals (200 adults of breeding age)

Population Trend

Declining

Date Declared Endangered

1986

Causes of Population Decline

Collection by smugglers for the illegal pet trade is the most critical threat to the tortoise population.

The introduced bushpig preys on tortoises as well as their eggs and young.

Fires employed to clear land for cattle grazing have destroyed tortoise habitat.

Collection for food over time has impacted populations to a lesser degree than the above activities.

Conservation Efforts

In addition to its IUCN listing, the angonoka tortoise is now protected under the national law of Madagascar and listed on Appendix I of CITES, prohibiting international trade in the species.

The Durrell Wildlife Conservation Trust created Project Angonoka in 1986 in cooperation with the Water and Forests Department, the Durrell Trust, and the World Wide Fund (WWF). The Project performs research on the tortoise and develops conservation plans designed to integrate local communities in the protection of the tortoise and its habitat. Local people have participated in conservation activities such as building firebreaks to prevent wildfire spread and the creation of a national park that will help protect the tortoise and its habitat.

A captive breeding facility was established for this species in Madagascar in 1986 by the Jersey Wildlife Preservation Trust (now the Durrell Trust) in cooperation with the Water and Forests Department.

How You Can Help

Support the efforts of the Durrell Wildlife Conservation Trust.

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Bove, Jennifer. "Profile: Angonoka Tortoise." ThoughtCo, Mar. 29, 2017, thoughtco.com/profile-of-the-endangered-angonoka-tortoise-1181987. Bove, Jennifer. (2017, March 29). Profile: Angonoka Tortoise. Retrieved from https://www.thoughtco.com/profile-of-the-endangered-angonoka-tortoise-1181987 Bove, Jennifer. "Profile: Angonoka Tortoise." ThoughtCo. https://www.thoughtco.com/profile-of-the-endangered-angonoka-tortoise-1181987 (accessed January 16, 2018).