Recreational drug use in animals

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Several non-human animal species are said to engage in apparent recreational drug use, that is, the intentional ingestion of psychoactive substances in their environment for pleasure, though claims of such behavior in the wild are often controversial. [1] This is distinct from zoopharmacognosy, in which animals ingest or topically apply non-food substances for their health benefits, as a form of self-medication.

Contents

Alcohol

Vervet monkeys

Vervet monkey consuming a human beverage (in this case non-alcoholic) Vervet drinking energy drink at Tshokwane.jpg
Vervet monkey consuming a human beverage (in this case non-alcoholic)

Some vervet monkeys in the Caribbean, particularly teenaged individuals, exhibit a preference for alcoholic beverages over non-alcoholic ones, a taste which likely developed due to the availability of fermented sugar cane juice from local plantations. [2] On Saint Kitts, these monkeys often raid bars and tourist beaches for alcoholic drinks, and become visibly inebriated. The proportions of the monkey population that do not drink, that drink in moderation, and that drink to excess mirror those proportions in humans. [3]

Myths

Elephants

According to legend, the fruit of the marula tree is sought by elephants for its alcohol content when ripe. Marula01.jpg
According to legend, the fruit of the marula tree is sought by elephants for its alcohol content when ripe.

South African legends, recorded as early as the 1830s by naturalist Adulphe Delegorgue, describe elephants seeking out the fermented fruit of the marula tree, and showing signs of intoxication, including increased aggression, after doing so. This behavior was controversially depicted in the 1974 documentary Animals Are Beautiful People : the crew of the film reportedly staged the scene, either by soaking the fruit in alcohol before allowing animals to eat it, [4] or by simply injecting the animals with a veterinary anesthetic to elicit symptoms of intoxication. [5] Studies have concluded that this is a myth. [6] [1] One of the studies instead attributed their aggression to the value of the trees as a food source. [2] Yet it may be possible that another intoxicant is at play – elephants are also known to eat the bark of the tree, which often contains toxic beetle pupae. [2]

Other intoxicants

Bees

A 2010 study from the University of Haifa reported that bees prefer nectar containing nicotine and caffeine over that without, and suggested that this preference may be part of the reward system driving the mutualistic feeding behavior. [7]

Cats

A domestic cat under the influence of catnip Catnip-effects.jpg
A domestic cat under the influence of catnip

About 70% of domestic cats are attracted to, and affected by, the plant Nepeta cataria , also known as catnip. The plant also affects some wild cats, including tigers, though the percentage of these cats affected is unknown. Cats sniff, lick, and sometimes chew the plant, and may rub against it, with their cheeks and whole body, by rolling over it. If cats consume concentrated extract of the plant, they quickly show signs of overexcitement, including violent twitching, profuse salivation, and sexual arousal. The reaction is caused by volatile terpenoids called nepetalactones present in the plant. Although these are mildly toxic and repel insects from the plant, their concentration is too low to poison cats. [8] :61–63

Dolphins

A rough-toothed dolphin Steno bredanensis 2.jpg
A rough-toothed dolphin

In 1995, the marine biologist Lisa Steiner reported that a group of rough-toothed dolphins near the Azores were pushing around inflated puffer fish and behaving lethargically. Puffer fish defensively excrete tetrodotoxin, which might have been having an intoxicating effect on the dolphins. [2] This behavior was also reported in the 2014 BBC documentary Dolphins - Spy in the Pod . [9] [10] However, tetrodotoxin is not known to be psychoactive, and only produces numbness, tingling, and lightheadedness in small doses, while in larger doses it is extremely toxic. [2] [9] For these reasons, marine biologist Christie Wilcox has expressed doubt that dolphins dose themselves with the toxin intentionally. [2]

Lemurs

Black lemurs have been documented gently biting toxic millipedes, which causes them to salivate, and then rubbing their saliva and the millipede secretions on their fur. The millipede toxins, including cyanide and benzoquinone, are thought to act primarily as an insect repellent, protecting the lemurs from diseases such as malaria, thus making this behavior a form of zoopharmacognosy. However, the toxins also appear to have a narcotic effect on the lemurs, causing them to enter an apparently blissful state, which may serve as a reward for the behavior. [11] [12]

Wallabies

In Tasmania, wallabies have been reported repeatedly entering commercial poppy fields, consuming the plants, and showing signs of intoxication. [13]

See also

Further reading

Related Research Articles

<i>Sclerocarya birrea</i> Species of tree

Sclerocarya birrea, commonly known as the marula, is a medium-sized deciduous fruit-bearing tree, indigenous to the miombo woodlands of Southern Africa, the Sudano-Sahelian range of West Africa, the savanna woodlands of East Africa and Madagascar.

<span class="mw-page-title-main">Amarula</span> Cream liqueur originating from South Africa

Amarula is a cream liqueur from South Africa. It is made with sugar, cream and the fruit of the African marula tree which is also locally called the elephant tree or the marriage tree. It has an alcohol content of 17% by volume. It has had some success at international spirit ratings competitions, winning a gold medal at the 2009 San Francisco World Spirits Competition. It has the taste of slightly fruity caramel.

<span class="mw-page-title-main">Foodborne illness</span> Illness from eating spoiled food

Foodborne illness is any illness resulting from the contamination of food by pathogenic bacteria, viruses, or parasites, as well as prions, and toxins such as aflatoxins in peanuts, poisonous mushrooms, and various species of beans that have not been boiled for at least 10 minutes.

<span class="mw-page-title-main">Jamie Uys</span> South African film director

Jacobus Johannes Uys, better known as Jamie Uys, was a South African film director, best known for directing the 1980 comedy film The Gods Must Be Crazy and its 1989 sequel The Gods Must Be Crazy II. Uys also directed the 1974 documentary film Animals Are Beautiful People.

<span class="mw-page-title-main">Zoopharmacognosy</span> Self-medication by animals

Zoopharmacognosy is a behaviour in which non-human animals self-medicate by selecting and ingesting or topically applying plants, soils and insects with medicinal properties, to prevent or reduce the harmful effects of pathogens, toxins, and even other animals. The term derives from Greek roots zoo ("animal"), pharmacon, and gnosy ("knowing").

<span class="mw-page-title-main">Black lemur</span> Species of lemur

The black lemur is a species of lemur from the family Lemuridae. Like all lemurs, it is endemic to Madagascar. Originally, the species was thought to have two subspecies, Eulemur macaco macaco and Eulemur macaco flavifrons, both of which were elevated to species status by Mittermeier et al. in 2008 to Eulemur macaco and Eulemur flavifrons respectively. The most startling difference between the two species is the eye colour; Eulemur flavifrons, the blue-eyed black lemur, has blue eyes, while Eulemur macaco, the black lemur, has brown or orange eyes, and also has ear tufts.

<i>Animals Are Beautiful People</i> 1974 South African nature documentary film

Animals Are Beautiful People is a 1974 South African nature documentary written, produced, directed, filmed and edited by Jamie Uys, about the wildlife in Southern Africa, presented with comedic elements. It was filmed in the Namib Desert, the Kalahari Desert and at the Okavango River and Okavango Delta. It was the recipient of the 1974 Golden Globe Award for Best Documentary Film.

Persin is a fungicidal toxin present in the avocado. Persin is an oil-soluble compound structurally similar to a fatty acid, a colourless oil, and it leaches into the body of the fruit from the seeds.

<span class="mw-page-title-main">Bees and toxic chemicals</span>

Bees can suffer serious effects from toxic chemicals in their environments. These include various synthetic chemicals, particularly insecticides, as well as a variety of naturally occurring chemicals from plants, such as ethanol resulting from the fermentation of organic materials. Bee intoxication can result from exposure to ethanol from fermented nectar, ripe fruits, and manmade and natural chemicals in the environment.

Many urban legends and misconceptions about drugs have been created and circulated among young people and the general public, with varying degrees of veracity. These are commonly repeated by organizations which oppose all classified drug use, often causing the true effects and dangers of drugs to be misunderstood and less scrutinized. The most common subjects of such false beliefs are LSD, cannabis, and PCP. These misconceptions include misinformation about adulterants or other black market issues, as well as alleged effects of the pure substances.

<span class="mw-page-title-main">Marula oil</span>

Marula oil is extracted from the kernels (nuts) of the fruits of the Marula tree, from the family Anacardiaceae. There are two types of marula oil, the oil extracted from the seeds and the oil extracted from the nut's hard shell. Marula oil is traditionally used in cosmetics, in food as a cooking oil and meat preservative and to treat leather. Marula oil can also be used as body lotion. In Namibia Marula fruit is processed into a range of juices, jellies and jams.

<span class="mw-page-title-main">Sanford's brown lemur</span> Species of lemur

Sanford's brown lemur, or Sanford's lemur, is a species of strepsirrhine primate in the family Lemuridae. Sanford's brown lemur was previously considered a subspecies of the common brown lemur but was raised to full species in 2001. It is named after Leonard Cutler Sanford, a trustee of the American Museum of Natural History.

Microbial toxins are toxins produced by micro-organisms, including bacteria, fungi, protozoa, dinoflagellates, and viruses. Many microbial toxins promote infection and disease by directly damaging host tissues and by disabling the immune system. Endotoxins most commonly refer to the lipopolysaccharide (LPS) or lipooligosaccharide (LOS) that are in the outer plasma membrane of Gram-negative bacteria. The botulinum toxin, which is primarily produced by Clostridium botulinum and less frequently by other Clostridium species, is the most toxic substance known in the world. However, microbial toxins also have important uses in medical science and research. Currently, new methods of detecting bacterial toxins are being developed to better isolate and understand these toxins. Potential applications of toxin research include combating microbial virulence, the development of novel anticancer drugs and other medicines, and the use of toxins as tools in neurobiology and cellular biology.

Psychoactive drugs, such as alcohol, caffeine, amphetamine, mescaline, lysergic acid diethylamide (LSD), cannabis, chloral hydrate, theophylline, IBMX and others, have been studied on certain animals. It is believed that plants developed caffeine as a chemical defense against insects.

<span class="mw-page-title-main">Toxic bird</span> Birds that are poisonous to touch and eat

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<span class="mw-page-title-main">Neosaxitoxin</span> Chemical compound

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<i>Dolphins - Spy in the Pod</i> Nature documentary series

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References

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