While asleep, cats experience short periods of rapid eye movement sleep often accompanied by muscle twitches, which suggests they are dreaming. However, due to a competing pathway with acetyl coenzyme A acetyl-CoA , niacin can become deficient and require supplementation. Unlike some big cats, such as tigers, domestic cats have slit pupils. The quick onset of these symptoms is due to the fact that diets devoid in arginine will typically still contain all of the other amino acids , which will continue to be catabolized by the body, producing mass amounts of ammonia that very quickly build up with no way of being excreted. A cat's body temperature does not vary throughout the day; this is part of cats' general lack of circadian rhythms and may reflect their tendency to be active both during the day and at night.
To aid with navigation and sensation, cats have dozens of movable whiskers vibrissae over their body, especially their faces. Vitamin A is considered to be a fat-soluble vitamin and is seen as essential in a cat's diet. However, this appears to be an adaptation to low light levels rather than representing true trichromatic vision. Another unusual feature is that the cat cannot produce taurine , [note 1] with a deficiency in this nutrient causing macular degeneration , wherein the cat's retina slowly breaks down, causing irreversible blindness. An individual cat always rights itself in the same way, provided it has the time to do so, during a fall. However, due to a competing pathway with acetyl coenzyme A acetyl-CoA , niacin can become deficient and require supplementation. A cat falling from heights of up to 3 meters can right itself and land on its paws. Normally, the conversion of beta-carotenes into vitamin A occurs in the intestine more specifically the mucosal layer of species, however cats lack the ability to undergo this process. Cat health and Aging in cats The average lifespan of pet cats has risen in recent years. In the wild, a higher place may serve as a concealed site from which to hunt; domestic cats may strike prey by pouncing from a perch such as a tree branch, as does a leopard. Cat behavior and Cat intelligence A cat on a fence Outdoor cats are active both day and night, although they tend to be slightly more active at night. It allows them to sense certain aromas in a way that humans cannot. During a fall from a high place, a cat can reflexively twist its body and right itself using its acute sense of balance and flexibility. The daily duration of sleep varies, usually between 12 and 16 hours, with 13 and 14 being the average. Because of its essential role, deficiency in arginine results in a buildup of toxic ammonia and leads to hyperammonemia. However, some of these products still fail to provide all the nutrients cats require,  and diets containing no animal products pose the risk of causing severe nutritional deficiencies. Another is that it is used to supply dietary fiber , helping the cat defecate more easily and expel parasites and other harmful material through feces and vomit. A cat's body temperature does not vary throughout the day; this is part of cats' general lack of circadian rhythms and may reflect their tendency to be active both during the day and at night. Cats have minimal ability to sweat, with glands located primarily in their paw pads,  and pant for heat relief only at very high temperatures  but may also pant when stressed. If niacin is deficient in the diet, anorexia, weight loss and an increase in body temperature can result. Most mammals can convert linoleic acid to arachidonic acid , as well as the omega 3 fatty acids eicosapentaenoic acid and docosahexaenoic acid through the activity of enzymes, but this process is very limited in cats. The quick onset of these symptoms is due to the fact that diets devoid in arginine will typically still contain all of the other amino acids , which will continue to be catabolized by the body, producing mass amounts of ammonia that very quickly build up with no way of being excreted. In the early s, it was about seven years, : Vaccinations are available for many of these diseases, and domestic cats are regularly given treatments to eliminate parasites such as worms and fleas. The term " cat nap " for a short rest refers to the cat's tendency to fall asleep lightly for a brief period.
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