Hyena
regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Carnivora | familia = Hyaenidae | familia_authority = Gray, 1821 | subdivision_ranks = Genera | subdivision = Crocuta
Hyaena
Parahyaena
Proteles
This article is about the animal species. For the characters from The Lion King see Shenzi, Banzai and Ed.
Hyenas (or Hyænas) are moderately large terrestrial carnivores native to Africa and the Indian Subcontinent. They are members of the family Hyaenidae.Although hyenas look like rather large wild dogs, they make up a separate biological family which is most closely related to Herpestidae (the family of mongooses and meerkats). The hyena has one of the strongest jaws in the animal kingdom and an adult of the species has only the large cats of the family Felidae (Lions, Tigers, etc.) to fear. An adult hyena's bite pressure can reach 800 lbs. per square inch; it can crush bone.
Hyenas range in length from 1.2 - 1.5 meters (3.9 - 4.9 ft) including the tail, which is 30 cm (12 inches) in length. An adult hyena weighs between 25 and 55 kg (55 - 120 lb). The pelt can be light to dark-brown on brown hyenas, while the color can be grey, sometimes nearly white on striped hyenas. Aardwolves have a warm, sand-colored coat, while the coats of spotted hyenas can range from dark-brown fur to amber and reddish in color. However, some Hyenas have spots.
Their front legs are actually longer than their back legs, giving them their distinctive gait. This feature, along with the fact that they have a heart twice the size of an adult lion, allows them to stalk their prey for many miles at about 6 mph, waiting for their prey to become exhausted from the chase, and then they can move in very quick at speeds of up to 30 mph.
In ancient times, large hyenas ranged over much of Europe and Asia, but they are much reduced in range and diversity today. Only four species survive: the spotted, brown, and striped hyenas (which together make up the subfamily Hyaeninae), and the aardwolf, which is the only member of the subfamily Protelinae.Hyenas are also highly intelligent predators, even more intelligent than the lions (some scientists claim they are of equal intelligence to certain apes) (Said by biologist Jeff Corwin, in an episode of "The Jeff Corwin Experience" concentrating on spotted hyenas). One indication of hyena intelligence is that they will move their kills closer to each other to protect them from scavengers; another indication is their strategic hunting methods (mentioned in "The Book about Animal Psychology" ("Bogen om Dyrepsykologi"), chapter 4, "Social behaviour" by Danish biologist Hans Lind).
One unusual feature of the hyena is that females have a pseudo-penis. Female hyenas give birth, copulate, and urinate through their pseudo-penis. Their pseudo-penis actually stretches to allow for the male penis to enter for copulation, so they have total sexual control over who is allowed to mate with them. The pseudo-penis also stretches during birth. Researchers originally thought that one of the things that causes this masculinization of the genitals is androgens that are expressed to the fetus very early on in its development. But it was discovered that when the androgens are held back from the fetus, you still get masculinization of the genitalia of the females, so scientists still have not figured out what causes the development of the pseudo-penis.The spotted hyenas are an example of how the cooperative form of hunting can be dictated by the type of prey, as well as the predator's ability to hunt and kill the different types of prey. When the hyenas hunt an animal that is bigger than themselves, they act in a dog- or wolf like behaviour; they hunt in packs and together take down the prey by biting into it and dragging it to the ground. If they are after smaller prey, they will hunt alone in a fox-like matter.
Like dogs, but unlike other animals in the same habitat, hyenas do not kill their prey directly. Having chased their prey to exhaustion, their prey is unable to mount any further defence of itself, and is captured and eaten while still alive. Although somewhat distasteful from the human perspective, the speedy disembowelment of the prey means that death often comes sooner than with the methods employed by other predators (for example, suffocation) and is an efficient means of eating which lessens the probability of the kill being lost to another predator.
Hyenas adapt their specific hunting strategy to the environment in which they live. In the Ngorogoro Crater, there is a very rich and concentrated amount of prey, and there are relatively many great beasts such as wildebeest or zebras. These animals are very much bound to one place and don't migrate. Here, hyenas live in large clans (between 10-100 members per Clan) and have established hunting territory which they often defend against neighbouring clans. The amount of large prey animals makes cooperative hunting more necessary than in the Serengeti, for example, where the clans often aren't that large and must follow the herds when they migrate. Hyenas following migrating prey are less territorial, and will often hunt small animals individually as well as large ones in packs. An adult hyena is capable of taking down a fully grown wildebeest alone, but hunting in packs is proven to be more effective and fast.
It is also common to see that some hyena clans actually have specialized in hunting certain types of prey. One clan may have specialized in hunting wildebeest, whilst another has specialized in hunting zebras. For instance, the "wildebeest hunters" often hunt in small groups (often 2-7 hyenas). When they approach the wildebeest herd, one of them runs into the herd and causes confusion. Then, it picks out a certain animal (usually the oldest, youngest or one that is wounded or weak) it begins to hunt down. The other hyenas then join it, scaring all other wildebeest away and concentrating on the unfortunate chosen one. Such a hunt can go for a couple of kilometres, with a speed up to 64 km per hour.When the prey is down, the hyenas share the food without any fights worthy to mention. In spite of the fact that they are equally hungry, they are tolerant and respect each others' ranks. The more is usually the better, since the prey can be effectively defended against other predators, such as lions.
The hunt of zebras is slightly different, however, since the social structure of wildebeest and zebra are different. The zebras huddle together when they spot the hyenas, and run away close to each other. A group of hyenas that are after zebras will find this hunt difficult, because the leading stallion fiercely defends his herd with kicks and bites. Again, one single fast and brave hyena must run up in front and distract the stallion, while another picks out an animal. As soon as this hyena bites, the others will join in, while two hyenas constantly distract the stallion, until it gives up. An average number of 11 hyenas is often required for such a hunt, but the number doubles up when it is feeding time. There is most often 6 hyenas hunting a wildebeest, but the number on feeding time is the same as with zebras. The difference in numbers when hunting is connected to how well the prey is able to defend itself. Hyenas have no illusions about their power, and only hunt the prey they are able to at the specific time (a number of 4 hyenas, for example, wouldn‘t even try hunting down a zebra). The size and behaviour of the hunting parties is therefore directly connected to the size and behaviour of the prey animals.Hyenas within the same clan rarely fight in a way that can damage them seriously. Most bickering is settled quickly, even by members that have similar ranking in the social hierarchy. Some loud noises and a couple of light bites is usually enough, and if the fight ever gets out of hand, it is quite normal for a hyena of a higher rank to step in and interrupt the fight. Even hyenas that are strange to each other would rather avoid battle than recklessly try to kill each other. Usually, scent marking territories avoids conflicts: if a lone hyena should enter a hostile territory anyway, it keeps a low profile and stays out in the borders. Female hyenas are treated with more hostility than males, since males from different clans are needed for breeding in the clan. Strangers are rarely accepted in a clan, but if so, they are usually placed at the bottom of the ranking system. If a clan member spots an intruder, it will quickly start scent marking, to make the intruder aware of that he is not welcome. Furthermore, the clan member will raise tail and make a whooping noise to warn the rest of the clan. Typically, the intruder will slink away before any physical contact is made.
The situation is different, however, when it comes to two clans fighting each other. The rules are much the same if it is one clan intruding into hostile territory. Hyena clans may try to take over weaker clans' territories, because of lack of prey or peace in their own territory. Human interaction is especially a reason for some clans do this: the more hyena territories shrink in and the wild animals are chased away to protect the livestock of the farmers, the more this tense clan rivalry is sharpened. When a member of the defending clan spots an enemy clan come too close, it calls the whole clan together. Cubs are sent down to their dens and some selected adult females stay and guard them. The other adults, male and female, huddle together with bristling manes and raised tails, making a rumbling "giggle". They form a kind of a wall, to keep the intruders from reaching further into their territory and most importantly, their cubs. The defenders stand their ground, don't back off and occasionally, one bold hyena of the group rushes out and attacks the enemies. More defenders typically follow, while there always are someone holding their ground, making sure of no intruders pass through. The attackers try to push themselves forward as well as possible. If the defenders try to spread them, they typically lunge over the hyena that started the attack to provoke the others and maybe make them unsure. It may sound confusing, but fights between clans actually are based on a strict set of rules. Unlike in media, where hyenas are portrayed as brutish and aggressive, lunging recklessly in to battle, the hyenas in real life carefully plan every move of attack and defense. The winning clan is usually the bigger, more numerous one, but not necessarily: If a clan has few members, but those members are extremely bold, the tables might actually turn.
The rules are slightly different when it comes to two clans on neutral territory. Then it typically is about defending or stealing a kill, but since this isn't as precious as a territory or young cubs, battles (if there are any) are normally very short and the winner is often the group with most members.
Nevertheless, under normal circumstances, these clan confrontations are rare compared to the many confrontations clans have with lions. When defending territories and dens, the behavior is similar to when the clan is attacked by other hyenas. There is increased attention on the cubs, though, since lions often pay visits to hyena territory to kill their offspring. Again, the hyenas huddle together to form a wall. It is naturally easier for the lions to break this wall, because of their bulk, but the hyenas quickly form it again as soon as they are spread. If the hyenas are too few, they will not really attack the lions, but stay in defense, trying to tire the big cats out. The lions get bored after some time and hopefully leave. If the hyenas are numerous enough, however, they lunge forward and aim for the lions' hindquarters and try to rip their haunches and bite their tails off. Since lions have both teeth and claws to fight with, hyenas are more likely to attack from the behind and drag the lion down on the ground, where they attempt to tear the soft belly apart. If it is the hyenas that are the attackers and are out to kill the lions' offspring, they come in large numbers, distracting most of the adult lions while a couple of quick hyenas snatch the cubs. At least four hyenas are needed to chase off a lioness, while at least six hyenas are required to even up a confrontation with an adult male lion. Again, biting and tearing from behind is preferred rather than facing the big cats' deadly claws.
Similar behavior is seen when stealing a kill, which hyenas are quite successful in. When defending a kill, the hyenas can be the losers when lions are involved, since they don't hunt in extremely large groups but rather prefer to kill several times the same night. The lions deliberately keep an eye on their arch enemies and come in large raiding parties to make sure they can steal the hyenas' prey. However, hyenas have learned to deal with this and usually they are fortunate enough to call more of the clan together and take their prey back.
Stealing kills from cheetahs and leopards and other loners, on the other hand, rarely requires fighting and calling the clan. It can get a bit dramatic when a hyena clan faces a pack of African wild dogs, but not nearly as violent as encounters with lions. Usually, it is the wild dogs that back out. In spite of being fierce killers, wild dogs are more docile than the aggressive hyenas.Hyenas have extremely strong jaws and compared to their body size, they are the most powerful of the Animal Kingdom. They also have a very powerful digestive system with highly acidic fluids. This makes them capable of eating and digesting their entire prey - including skin, teeth, horns, hooves and even bones. Since they eat carcasses, their digestion system deals very well with bacteria as well. Their excrement can be either brown or white (white being the result of the digestion of bone material).A group of spotted hyenas (called a "clan") can include 5-90 members and is led by a single alpha female called the matriarch. A complicated social hierarchy governs the clan, which cubs often learn before they begin to walk. Females are the dominant members, followed in rank by cubs, while adult males rank lowest. Male hyenas, which are usually smaller and less aggressive than females, often leave the clan when they are about two years old. Females tend to mate with males from other clans, thereby preventing inbreeding. Unlike many other animals, female hyenas very rarely mate with highly aggressive males. Instead, they select calm, patient and charming mates. Patience is especially important since courtship can last as long as a year. For this reason, dominant and impatient males have difficulty finding mates. Despite the complicated courtship, the female raises her pups without the male. | Lower jaw of Hyaena eximia |
Hyenas are born with teeth, which means that sometimes when the cubs play-fight they can accidentally kill each other. Hyenas produce such nutritious milk that, unlike lions and wild dogs, they can leave their cubs for about a week without feeding them. This allows them to follow the herds of wildebeest, thus ensuring that they can obtain the best prey.Despite common belief, only some species belonging to this family are scavengers, and most of the prey consumed by hyenas was killed by hyenas. The brown and the striped hyena are the only true scavengers, deriving most of their food from others, and the spotted hyena is a true predator, and the most effective predator on the African Savannah. The Aardwolf usually eats insects like termites.Much like wolves, hyenas have a less glorious role in movies and literature, mostly filling in as the villains. This, however, is understandable: even in the early researches of these animals, naturalists knew little about them. They were mysterious, lived in groups, hunted at night and made sounds that are quite human-like (for example the "laughing"). There was much folklore about hyenas because they typically scavenge most during the day, where the humans have possiblity to see it. At night, they were feared because this was their natural hunting time and they come out in great numbers. Nocturnal animals often are mysterious in folklore as well as real life. The carrion-eating made the hyena even more unpopular and it didn't make it better that the animals often dug up graves to eat the remains of corpses down there. This behavior made them seem unclean and cowardly, and because of the usual bickering between the ranks and their enormous appetite, they were thought to be greedy and selfish.In local folklore, it was believed that the sight of a hyena's shadow could strike dogs dumb with fear and the sight of its skin would even make the leopard's fur fall out in fright.
Early naturalists thought hyenas were hermaphrodites or the result of the mating of a dog with a wolf. According to early writings such as Ovid's Metamorphoses and the Physiologus, the hyena continually changed its sex and nature from male to female and back again. It, therefore, became an image of sexual deformity, prostitution, and deviant sexual behavior (which ultimately made them popular symbols of the homosexual community).
The hyena was also a symbol of wisdom and cleverness, however, because of its constant laughter, its knowledge was seen to be that of the debased, profane, earthly, or initiatory kind. The wise hyena was a fool compared to the all-knowing God and symbolized the foolishness of man's wisdom as opposed to that of the Father (I Cor 1:25).
It was believed to have powers of divination and fascination and to know the secrets of magic, the dead, and various hidden or demonic forces. It was thought to imitate human voices and call its victims by name. This talent made it a symbol of the Devil who disguised his tempting voice as that of an angel. He caused confusion in his prey and hypnotized them with his shadow or the touch of his paw. It was believed that the souls of humans it had eaten remained forever visible in the eyes of the hyena who devoured them. Sorcerers hunted with hyena packs and became hyenas themselves in order to tear their enemies apart. Witches and ghosts were thought to ride upon these beasts.
In modern culture, these images unfortunately still stick on to the hyenas. Hyenas, especially spotted ones, are hard to train for movies. Their wild instincts are difficult to tame and they are proven to be too intelligent for their own good and refuse to constantly do the same trick, simply because it bores them. They have, however, been used in animated movies many times.Mostly, they are portrayed as savage, unintelligent, hungry and cowardly brutes, opposing the "royal lion" (for example in Disney's movie "The Lion King"). They are still vicious and greedy, but extremely cowardly, only daring to attack when they are many. They are popularly used henchmen or spies by greater animals (as in "Kimba the White Lion") or as cannonfodder in battle. Sometimes, they are even placed randomly in movies, only to oppose a lion character. In Disney's "The Chronicles of Narnia - The Lion, The Witch and The Wardrobe", a hyena is seen snapping at Aslan the lion's feet, when he walks to the Stone Table. C.S. Lewis, author of the popular books, never mentioned a hyena, and the movie character never had a bigger role than the snapping, so this proves excellently how media still portrays the hyenas as bad guys, despite the evidence of their admirable traits. Devilish CGI hyenas were used for "Exorcist: The Beginning" where they were supposed to attack a young boy. However, their laughing also make them excellent comic reliefs - they are not necessarily villains, but random characters (as in several episodes of "Cow And Chicken"), idiotic and humouristic. Sometimes, the laughing is a cover and the hyena behind is a serious, intelligent or even depressed character, like the real life clowns. A very depressed sidekick, named Hardy Har Har, is shown in Hanna-Barbera's "Lippy the Lion". This hyena hardly ever smiles and never actually laughs, making him a bit of an odd-ball.Family Hyaenidae
* Subfamily Hyaeninae
**Spotted Hyena Crocuta crocuta (this is the "Laughing Hyena")
**Brown Hyena Parahyaena brunnea (formerly Hyaena brunnea)
**Striped Hyena Hyaena hyaena
* Subfamily Protelinae
** Aardwolf Proteles cristatus# G.W.B. Huntingford, The Galla of Ethiopia; The Kingdom of Kafa and Janjero (London: International African Institute, 1955), p. 126.
*Hyena: Wildlife summary from the African Wildlife Foundation
*Robin M. Weare's Hyena pages
*Nature-Wildlife
*Excerpt about hyenas from Richard D. Estes's "The Safari Companion" (ISBN 1890132446)
*Kay E. Holekamp laboratory
*Hyena photo and information
*A mechanism for virilization of female spotted hyenas in utero
*The Hyaenidae Family from Lioncrusher's Domain
*The Hyaena Specialist Group
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