Postural and kinematic characteristics of the drinking behaviour in the diamondback turtle, Malaclemys terrapin (Latreille) were investigated by video and high-speed filming experiments. Head, jaw and throat movements in drinking cycles are described. Postures of neck and head were compared for three water depths (2, 10 and 30 mm). Water expulsion, occurring after the turtle was disturbed, is also kinematically described. Finally, a drinking mechanism in the turtle is proposed.