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BiologyThe spiny turtle has not thrived in captivity and relatively little is known of its breeding habits (8). Mating behaviour is apparently stimulated by rains, with males becoming excited when sprayed with water in captivity, chasing females in an attempt to mount. Nesting behaviour is unknown in the wild, but generally one or two eggs are laid per clutch (clutches containing three eggs have been recorded) in captivity, usually at night or in the early morning (7). Up to three clutches have been produced a year (7), and to enable the passage of these relatively large eggs, a hinge develops in the female's plastron to allow greater flexibility during egg-laying (5). There have only ever been a handful of successful captive breeding efforts of the spiny turtle, and those that have been successful have had incubation periods of 106 days (2), 110 days (9) and 145 days (10). The spiny turtle is apparently herbivorous in the wild, preferring fruits and vegetables, but will accept some animal foods in captivity (5) (7).