Fossilized fish embryos are the earliest evidence for both internal fertilization and live birth in vertebrates. View image of Thinkstock Credit: It only takes one eager sperm to begin the road from conception to birth, but the lioness doesn't seem to mind. The simplest explanations for that pattern suggest that the rats' behaviour is adaptive because a diversity of foods allows them to ingest a wider range of nutrients, or maybe because it allows them to avoid overdependence on a possibly limited food source. Clearly, these were not situations where eggs were going to be laid in the water for males to come and season with sperm.
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The urge to seek out that sort of pleasure, writes Balcombe, "is a combination of instinct on the one hand, and a powerful desire to attain reward on the other. In the last 10 to 15 years, scientific evidence has begun to accumulate that animals do experience a general sensation of pleasure — as anybody who has stroked a cat will know. Female cheetahs and lions lick and rub the males' genitals as a part of their courtship ritual. It would be like staring at a painting with half the colour spectrum removed from it. But you don't need to be a bonobo to enjoy "non-conceptive" sex, white-faced capuchin monkeys do it too. That's in part because this macaque behaviour is sometimes accompanied by the type of physiological changes seen in humans, such as increases in heart rate and vaginal spasms.
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When Did Sex Become Fun?
And that means they are some of the earliest evidence of bleeping. Fossilized fish embryos are the earliest evidence for both internal fertilization and live birth in vertebrates. In most cases, researchers rely on evolutionary mechanisms to explain such animal behaviour, to resist the pull of anthropomorphosis. B ut after th e origins of sex, it took another 1. While it's impossible to ask a female macaque to interrogate her feelings, it is reasonable to infer that this behaviour is similar to that experienced by human women, at least in some ways. It only takes one eager sperm to begin the road from conception to birth, but the lioness doesn't seem to mind.
Description:Another way you might learn whether non-human animals derive pleasure is whether they have orgasms. What is BBC Future? But actually, as long as it enables successful reproduction, copulation only needs to be rewarding for one of the mating pair—on condition that one partner is able to manipulate its mate into copulating. Can a fish have fun? Well, at least for the male. In a third of those copulations, they observed what they called female orgasmic responses: It's been observed in primates, spotted hyenas, goats and sheep.