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Alex Quinn, a Ph. Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination GSD and temperature-dependent sex determination TSD. Species in the genotypic group, like mammals and birds, have sex chromosomes, which in reptiles come in two major types.

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Want to get expert opinion about what it means to be dreaming about snakes? For Freud, your snake dreams are most likely expressing some unconscious sexual desire. For Jung, dreaming of snakes is a representation of an inner conflict of personal nature or connected to larger universal archetypes, such as symbols of healing or life forces.

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When it comes to sex, males and females are not always equal in their desires. Similar to the struggle between a parasite and its host, some species are locked in an evolutionary arms race between the sexes, with each gender battling to put its best interests forth. Although male and female sexual preferences and tactics are as variable as the thousands of species they represent, a particular species of snake provides an interesting example of conflict that can occur during mating itself, researchers describe in the journal Proceedings of the Royal Society B. The authors focused their paper on an intimate discussion of red-sided garter snake behaviors.

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Sexing snakes by probing still makes me nervous. Basically probing is meant to find one of the hemipenes. Kingsnakes Lampropeltis getula sometimes squirt blood from the cloaca during probing.

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It can be difficult to work out if a reptile is a male or female as often there is very little if any external differences between the sexes. This is in contrast to most mammals where gender determination is generally straight forward. Birds are also becoming increasingly easier to sex as we now have access to incredible DNA technology where we can tell the sex of your bird from 1 drop of blood — unfortunately this technology is not yet available for reptiles.

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Canadian red-sided garter snakes have developed remarkable genital armory to try to gain an advantage over their mates. Understanding sex under such extreme conditions may help us grasp how it works for species where the process is less obvious. Thamnophis sirtalis infernalis spend the bitter Canadian winter hibernating in limestone caves. Instead, the females mate with lots of males while the going is good.

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Is it possible the unused hemipene helps exert a force on the female's tail that keeps the active one lodged in? I am thinking it could act as a fulcrum. This would be useful for both snakes and lizards.

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One might think having no limbs would put a damper on the love life, but not for snakes. When a female snake is ready to mate, she begins to release a special scent pheromones from skin glands on her back. As she goes about her daily routine, she leaves an odor trail as she pushes off resistance points on the ground See Getting Around. If a sexually mature male catches her scent, he will follow her trail until he finds her.

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