Take tortoises as an example for gender identification. The characteristics are:
(1) Most female tortoises are yellowish-brown or loess in color, while male tortoises are mostly dark black in color;
( 2) The female turtle is larger in size, the back shell is narrow in front and wide in the back, the texture is rough and thick, and the concentric rings on the scutes are clear. The male turtle is smaller in size, the back shell is wide in front and narrow in the back, the texture is smooth and thin, and the concentric rings on the scutes are clear. Unclear;
(3) The female turtle has a straight abdominal carapace, a thick and short tail, and the male turtle has a slightly concave abdominal carapace. To adapt to mating, the tail is slender and the base is thick (the mating organ is at the base);
(4) Female turtles have no peculiar smell, while male turtles have a special smell.
The age is calculated based on the number of concentric rings (growth rings) on the scutes of the turtle's carapace. One ring is The growing season of the year. Of course, factors such as different turtle species, ring clarity, and the presence of rings at hatch will also affect age accuracy. Turtles generally have a long lifespan and can live for decades. According to records, one kind of tortoise has a lifespan of more than 150 years, so it has a long life reputation of "a thousand-year tortoise and ten thousand years of turtle".
