Ultrasonography in reptiles is a safe, noninvasive repeatable diagnostic imagine method. Size, volume and inner structure of organs can easily be determined. Based on 460 ultrasonographic examinations in 8 species of terrapins, 12 species of snakes and 22 species of lizard normal appearance of heart, gonads, fat bodies, kidneys, bladder and gastrointestinal tract are described. Pathological findings are explained in details using examples.