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Energy Level
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Turtles are low-energy animals, but if they begin to behave more sluggishly than usual, it is a sign of an illness. Your turtle should spend time sunbathing and swimming, or grazing if it is outside in a pen. Watch your turtle for signs that it has not moved during the day.
Disorientation
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A turtle that acts disorientated could be ill. Running into the sides of the aquarium or pen or swimming into things is a symptom of illness. The turtle could have a vitamin A deficiency, which can cause the eyelids to swell shut or can otherwise affect the a turtle's vision.
Eating
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Illness can disrupt your pet turtle's usual eating habits. If the turtle won't eat according to its usual schedule, it could be a sign of illness.
Breathing
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Turtles can catch colds that can turn into serious respiratory infections. Look for signs of gasping, sneezing or other behaviors that show the turtle is having trouble breathing.
Skin Issues
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Turtles that try to scratch their skin or rub up against rough objects could have a skin infection, often caused by fungus.
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Illness Behavior in Pet Turtles
Pet turtles can catch a variety of illnesses just like any other pet. They exhibit certain identifiable behavioral symptoms when ill. If your pet shows these symptoms or you suspect it is ill, take it to your veterinarian.