Adult nursing — the act of breastfeeding another adult — has been documented for centuries. To modern eyes it all sounds a little bit, well, strange. We generally consider breastfeeding to be restricted to mothers and babies. But many adults still do it, even the briefest search on social media brings up plenty of talk about Adult Nursing Relationships ANR. The thought of it had never caused an arousal before. I got off on it and my wife — while not really understanding why — enjoyed the fact that I was enjoying that aspect of her.
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The head louse Pediculus humanus capitis is an obligate ectoparasite of humans that causes head lice infestation pediculosis capitis. Head lice are wingless insects that spend their entire lives on the human scalp and feeding exclusively on human blood. Other species of lice infest most orders of mammals and all orders of birds,  as well as other parts of the human body. Lice differ from other hematophagic ectoparasites such as fleas in spending their entire lifecycle on a host. The non-disease-carrying head louse differs from the related disease-carrying body louse Pediculus humanus humanus in preferring to attach eggs to scalp hair rather than to clothing. The two subspecies are morphologically almost identical, but do not normally interbreed, although they will do so in laboratory conditions. From genetic studies, they are thought to have diverged as subspecies about 30,—, years ago, when many humans began to wear a significant amount of clothing.
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Feeding is the process by which organisms, typically animals , obtain food. The evolution of different feeding strategies is varied with some feeding strategies evolving several times in independent lineages. In terrestrial vertebrates, the earliest forms were large amphibious piscivores million years ago. While amphibians continued to feed on fish and later insects, reptiles began exploring two new food types, other tetrapods carnivory , and later, plants herbivory.