Common Problems in Leopard Tortoises

Common Problems in Leopard Tortoises
By Asst. Prof. Dr. Somphoth Weerakul (Mor Kaew)

Copyright: Journal of Exotic Pet Clinical Practice, 2017 (25/8/2017)

Figure Captions:

A, B, C: Radiographs of a Radiated tortoise shell showing abnormalities.
D: Radiograph of a normal Yellow tortoise (Elongated tortoise) shell.

The Leopard Tortoise is a highly popular species among reptile enthusiasts in Thailand. It is estimated that there are over 18,000 reptile keepers in the country, many of whom specialize specifically in tortoises. This species is divided into two subspecies: the Common Leopard Tortoise (Stigmochelys pardalis babcocki) and the South African Leopard Tortoise (Stigmochelys pardalis pardalis).

The etymology of their name is quite revealing: the Greek word Stigma means "spotted" and Chelone means "tortoise." Their characteristic leopard-like spots are most vivid during their growth phase; as they reach maturity, the colors may fade or turn into a plain brown or grey, which is considered normal. Ranking as the world's 4th largest tortoise species, they can reach lengths of up to 70 cm (averaging 40 cm) and weigh up to 40 kg (typically between 13–20 kg).

Natural Habitat and Diet
Leopard tortoises inhabit semi-arid to arid grasslands and savannas across East, North, and South Africa—including Sudan, Ethiopia, Zambia, Botswana, Namibia, Angola, and Somalia. Notably, they are not found in the humid rainforests of Central Africa. Consequently, they are biologically adapted to a diet of dry, coarse, high-fiber forage. They obtain hydration from succulents, young grass, and thorny plants like cacti.

While classified as true herbivores (100% plant-based), they are occasionally observed scavenging animal carcasses, bones, or even the dung of carnivores to supplement essential minerals, particularly calcium. However, they have a very poor ability to digest cereal grains.

The Risks of Improper Captivity
Experts like A.C. Highfield argue that these tortoises are often kept in unsuitable conditions. Replicating their natural diet is crucial for survival. Providing food that is too moist or succulent—such as excessive fresh vegetables and fruits—significantly increases the risk of mortality.

This issue is linked to a lack of high-fiber roughage. When the diet lacks fiber, the tortoise suffers from:

Gastrointestinal Hypomotility: Known as "colic" (similar to horses or elephants), where the bowels become stagnant.
Microbial Dysbiosis: As gut motility slows, beneficial bacteria decrease while pathogenic microbes and flagellate protozoa multiply rapidly. This shift often leads to systemic acidosis and subsequent organ failure.
Growth Rates and Skeletal Health
Western zoologists have observed that many keepers focus too much on "power-feeding" to accelerate growth. Rapid growth leads to:

Skeletal deformities.
Accumulation of urates, leading to gout and bladder stones.
Liver damage.
Case Study Observations
In a study of Leopard tortoises over 30 cm in size, several subjects exhibited persistent diarrhea followed by a total cessation of defecation (constipation) and severe lethargy. Many in the group had already died.

Physical Exam & Diagnostics:

Abdominal Bloating: Swelling visible in the pockets of the front and hind legs.
Respiratory Distress: Labored breathing in some cases.
Pyramiding: Raised, pyramid-like scutes on the shell (See Figure A).
X-ray Findings: Radiographs revealed generalized ileus (intestinal standstill), thickened intestinal walls, and compressed lung space.
Necropsy: Deceased tortoises showed swollen, inflamed intestinal walls and multi-organ inflammation.
A striking finding in Leopard tortoises, more so than in other species, is the separation of the spinal column from the carapace (See Figure B) and the warping of the bones in the thoracic cavity (See Figure C). When compared to a healthy tortoise (See Figure D), where the spine and shell are fused, these deformities are stark.

Conclusion
While Metabolic Bone Disease (MBD) may not cause immediate death, it leads to permanent stunting and, in rare cases, neurological issues like paresis or paralysis. X-rays are vital for early detection, as spinal lifting correlates 100% with external shell "pyramiding."

The Leopard tortoise was chosen for this article due to its rising popularity and high market value. However, the pathology—intestinal inflammation, systemic acidosis, and skeletal deformity—is a risk for all large tortoise species (such as the Radiated tortoise) when forced to grow too quickly on an improper diet. Understanding these risks is essential for the long-term health and survival of these magnificent reptiles.