Reproduction
Courtship and mating activities for red-eared sliders usually occur between March and July, and take place under water. The male swims toward the female and flutters or vibrates the back side of his long claws on and around her face and head. The female swims toward the male and, if she is receptive, sinks to the bottom for mating. If the female is not receptive, she may become aggressive towards the male. The courtship can take up to 45 minutes, but the mating itself usually takes only 10 to 15 minutes.
Sometimes a male will appear to be courting another male. This is actually a sign of dominance, and they may begin to fight. Juveniles may display the courtship dance, but until the turtles are 5 years of age, they are not mature and are unable to mate.
After mating, the female spends extra time basking to keep her eggs warm. She may also have a change of diet, eating only certain foods or not eating as much as she normally would. Mating begins in May and egg-laying occurs in May through early July. A female might lay from 2 to 30 eggs, with larger females having larger clutches. One female can lay up to 5 clutches in the same year, and clutches are usually spaced 12 to 36 days apart. The time between mating and egg laying can be days or weeks.
The sex of red-eared sliders is determined by the incubation temperature during critical phases of the embryo’s development. Only males are produced when eggs are incubated at temperatures of 22–27 °C (72–81 °F), whereas females develop at warmer temperatures.
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