乌龟又叫金龟、金头龟,是龟类中最常见的一种,它属于爬行纲、龟鳖目、龟科。乌龟的背腹甲固定,不能活动,腹面略带黄色或棕黄色,有暗褐色斑纹,雌龟背甲上有3条隆起的纵棱,雄龟背甲上的纵棱不明显。乌龟头顶前部皮肤平滑,后部呈细粒鳞状,颈侧面有黄色线状斑纹。乌龟四肢强壮有力,外形略扁,指趾间具全蹼,适宜于游泳,除后肢第5趾外,其它指趾末端都有爪,虽说它在陆上显得有些笨拙,爬行速度很慢,不过到了水中却十分灵活、沉浮自如。乌龟的防御本领很差,遇到危险时,只能将头、四肢和尾巴缩入连成一体的背 Turtle, also known as the beetle, golden turtle, is the most common type of turtle, it belongs to the reptile, turtle turtle head, turtle family. Turtle’s carapace fixed, can not move, the ventral slightly yellow or brown, dark brown markings, the female carapace has three raised vertical edges, male turtle vertical edge is not obvious. The front of the tortoise head smooth skin, the rear was fine-grained, the neck side of the yellow linear markings. Turtle limbs strong and powerful, slightly flat shape, with a webbed toe, suitable for swimming, in addition to the hindlimb 5th toe, the other end of the finger has claws, although it appears on the ground some clumsy, crawling speed is very slow, but To the water is very flexible, ups and downs. Tortoise defense skills are poor, in case of danger, only the head, limbs and tail retracted into one of the back