Snakes do not have very good eyesight, so how a male snake could spot a particularly big female from a distance is unclear. So how do males get ahead? The anaconda's swollen body suggested she was full of food, so Rivas waited for her to throw up: He thinks that assumption stems from bias by early researchers, who were predominantly male. Observing a mating group from the inside, perhaps with a camera, could reveal the process involved. It is certainly common for several male snakes to be attracted to the same female. In any case, females do not necessarily pick a single suitor. In the Malaysian region of Borneo, a female paradise flying snake was photographed in a braid-like entanglement with four males.
He thinks polyandry — in which each female mates with multiple males — is likely to be the ancestral mating system in snakes. In anacondas, females are on average 4. Males seem to be drawn to these reproductive benefits: For example, in a study Mark O'Shea from the University of Wolverhampton in the UK and his colleagues reported an instance of multi-male courtship in the paradise flying snake. However, the garter snakes only do this in certain places. But it is not obvious how the males make this choice. Several mating groups often gather at once in crevices above ground, littering the landscape with thousands of snakes. On the ground, snake "orgies" tend to be much larger. The trouble with all these snake orgies is that it is not clear which of the males, if any, actually succeeds in producing offspring. But there may well be more of an element of female choice. Garter snake courtship can be even more extreme. But it is not quite as simple as that. View image of A breeding ball of anacondas Eunectes murinus Credit: But most male snakes do not exhibit such stereotypically male behaviour. Often, a dozen prospective partners present themselves , wrapping themselves around the female in a ritual that can last for up to a month. One idea is that promiscuity allows females to stock up on seminal fluids, which provide her with nutrition. During the breeding season, longer females had higher proportions of certain chemicals in their skin. It is certainly common for several male snakes to be attracted to the same female. After a female emerges from hibernation and sheds her skin, she releases pheromones that draw males towards her. Keel-bellied whipsnakes , a closely-related species, have also been observed in a similar courtship braid. Previously, scientists had assumed that female snakes are submissive during courtship and mating, but it is now clear that they have a prominent role. So how do males get ahead? The team suspects that the males competed for the prime copulation position during the journey. Observing a mating group from the inside, perhaps with a camera, could reveal the process involved. This could explain why male snakes do not benefit from being larger.
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