Turtles House

Diet

Radiateds are primarily herbivorous animals. Excessive protein as well as all animal protein should be avoided as they are highly prone to pyramiding. G. radiata are also extremely attracted to any foodstuff that are red in color.

Breeding and Propagation

Breeding should not be attempted until males and females are slightly larger than a foot. Males initiate breeding with a courtship ritual that consists of circling the female, sniffing her legs and bobbing his head. If the male begins trying to lift the female, do not worry, as this is quite normal. This behavior may be done to attempt to prevent her from moving away. The male will mount her from behind once she stops moving. After mating, the female will dig a nest and deposit anywhere from 3 to 12 eggs. In captivity, it can take anywhere from 145 to 231 days until hatching.

Biology

Males reach sexual maturity once they have attained a carapace length of around 30 cm. Rival males will fight during the breeding season and attempt to roll one another onto their backs. They initiate courtship by a head-bobbing display and smelling the female’s hind legs. This is followed by energetic circling and butting of the female’s carapace. Once mating has occurred, the female lays her clutch of 3–12 eggs in a nest dug into the ground. Eggs are laid at the end of the wet season, between February and April, and hatch after 10 months or more. Hatchlings emerge within a few weeks of one another at the onset of the next rains, in November or December.

Radiated tortoises graze on vegetation such as leaves and grasses, flowers, fruit and cacti. During much of the year dead leaves also make up a substantial part of their diet.

Physiology

It is one of the most beautiful tortoise species. The shell has dark plates with bright yellow lines radiating from the center of each shell. It has a high-domed carapace, blunt head, and elephantine feet. Its legs and feet are yellow, as is its head except a black patch on top. Males generally have a longer tail than females.

Threats

The principal activity threatening the tortoise is collection for consumption and the wildlife trade. This is conducted by organized groups with large-scale operations, as well as by individual collectors who plunder as they can. The destruction of habitat is also a key threat, not only to the Radiated tortoises, but to the integrity for southern Madagascar. The production of cash crops destined for export have fueled a rapid clearance of natural habitats where vast tracts of spiny forest have been permanently transformed to low-grade grassland where few native species can survive. Recent analyses of satellite images for the period between years 1990 and 2000 show that this region has lost more natural habitat cover than any other part of the country. In August 2005, an international meeting of the Population and Habitat Viability Assessment (PHVA) group produced an alarming prediction that without immediate and significant intervention, a viable population of radiateda tortoises will likely be extirpated from the wild within one tortoise generation, that is, 45 years.

Reproduction

Males first mate upon attaining lengths of about 12 inches (31 cm); females may need to be a few inches longer. The male begins this fairly noisy procedure by bobbing his head and smelling the female’s hind legs and cloaca. In some cases the male may lift the female up with the front edge of his shell to keep her from moving away.

The male then proceeds to mount the female from the rear while striking the anal region of his plastron against the female’s carapace. Hissing and grunting by the male during mating is common. Females lay from three to 12 eggs in a pre-excavated hole six to eight inches (15 to 20 cm) deep and then depart.

Incubation is quite long in this species, lasting usually between five and eight months. Juveniles are between 1.25 to 1.6 inches (3.2 to 4 cm) upon hatching. Unlike the yellow coloration of the adults, the juveniles are a white to an off-white shade. Juveniles attain the high-domed carapace soon after hatching.