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All rights reserved. Photographer Luciano Candisani has captured the first-ever photographs of a green anaconda squeezing her mate to death in Brazil. While tracking down a particularly large snake in the swamps of Brazil , photographer Luciano Candisani got more than he'd hoped for: the first known image of a female green anaconda squeezing her mate to death. They found her half-out of the water, entangled with a small male on the river bottom—perhaps, Candisani thought, a post-mating embrace. He watched the pair for a few hours, taking some underwater photographs from about three feet away.
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Snakes and female sexuality

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Snakes and female sexuality | Nature

The vomeronasal organ VNO is important for activating accessory olfactory pathways that are involved in sexually dimorphic mating behavior. The VNO of male garter snakes is critically important for detection of, and response to, female sex pheromones. In the present study, under voltage-clamp conditions, male snake VNO neurons were stimulated with female sexual attractiveness pheromone. The amplitude of the inward current was dose dependent, and the relationship could be fitted by the Hill equation. Under current-clamp conditions, application of pheromone produced membrane depolarizing responses and increases in firing frequency. These results suggest that the female pheromone directly affects male snake VNO neurons and results in opening of ion channels, thereby converting the pheromone signal to an electrical signal. The response to female pheromone is sexually dimorphic, that is, the pheromone does not evoke responses in VNO neurons of female snakes.
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Sexual selection in scaled reptiles

With their sinuous bodies, sharp fangs and, sometimes, potent venom, snakes have long struck fear into the hearts of humans and our primate ancestors. But when it comes to mating, do these ancient reptiles also have a softer side? Though snakes garner much media and research attention, the reproductive strategies of many species are still shrouded in mystery.
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Sexual selection in scaled reptiles studies how sexual selection manifests in snakes and lizards , which constitute the order Squamata of reptiles. Each of the over three thousand snakes use different tactics in acquiring mates. It is common for neck biting to occur while the snakes are entwined. In the species Japanese striped snake Elaphe quadrivirgata , competition involves males maintaining body contact with their opponent and exerting pressure by pushing, topping, or entwining in order to subdue him.

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